The Collaborative International Dictionary of English v.0.48:

Push \Push\, n. [Probably F. poche. See Pouch.]
   A pustule; a pimple. [Obs. or Prov. Eng.] --Bacon.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Push \Push\, v. t. [imp. & p. p. Pushed; p. pr. & vb. n.
   Pushing.] [OE. possen, pussen, F. pousser, fr. L. pulsare,
   v. intens. fr. pellere, pulsum, to beat, knock, push. See
   Pulse a beating, and cf. Pursy.]
   1. To press against with force; to drive or impel by
      pressure; to endeavor to drive by steady pressure, without
      striking; -- opposed to draw.
      [1913 Webster]

            Sidelong had pushed a mountain from his seat.
                                                  --Milton.
      [1913 Webster]

   2. To thrust the points of the horns against; to gore.
      [1913 Webster]

            If the ox shall push a manservant or maidservant, .
            . . the ox shall be stoned.           --Ex. xxi. 32.
      [1913 Webster]

   3. To press or urge forward; to drive; to push an objection
      too far. " To push his fortune." --Dryden.
      [1913 Webster]

            Ambition pushes the soul to such actions as are apt
            to procure honor to the actor.        --Spectator.
      [1913 Webster]

            We are pushed for an answer.          --Swift.
      [1913 Webster]

   4. To bear hard upon; to perplex; to embarrass.
      [1913 Webster]

   5. To importune; to press with solicitation; to tease.
      [1913 Webster]

   To push down, to overthrow by pushing or impulse.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Push \Push\, v. i.
   1. To make a thrust; to shove; as, to push with the horns or
      with a sword. --Shak.
      [1913 Webster]

   2. To make an advance, attack, or effort; to be energetic;
      as, a man must push in order to succeed.
      [1913 Webster]

            At the time of the end shall the kind of the south
            push at him and the king of the north shall come
            against him.                          --Dan. xi. 40.
      [1913 Webster]

            War seemed asleep for nine long years; at length
            Both sides resolved to push, we tried our strength.
                                                  --Dryden.
      [1913 Webster]

   3. To burst pot, as a bud or shoot.
      [1913 Webster]

   To push on, to drive or urge forward; to hasten.
      [1913 Webster]

            The rider pushed on at a rapid pace.  --Sir W.
                                                  Scott.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Push \Push\, n.
   A crowd; a company or clique of associates; a gang. [Slang]
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Push \Push\, n.
   1. A thrust with a pointed instrument, or with the end of a
      thing.
      [1913 Webster]

   2. Any thrust. pressure, impulse, or force, or force applied;
      a shove; as, to give the ball the first push.
      [1913 Webster]

   3. An assault or attack; an effort; an attempt; hence, the
      time or occasion for action.
      [1913 Webster]

            Exact reformation is not perfected at the first
            push.                                 --Milton.
      [1913 Webster]

            When it comes to the push, 'tis no more than talk.
                                                  --L' Estrange.
      [1913 Webster]

   4. The faculty of overcoming obstacles; aggressive energy;
      as, he has push, or he has no push.
      [1913 Webster] [Colloq.]
      [1913 Webster]

   Syn: See Thrust.
        [1913 Webster]

WordNet (r) 3.0 (2006):

push
    n 1: the act of applying force in order to move something away;
         "he gave the door a hard push"; "the pushing is good
         exercise" [syn: push, pushing]
    2: the force used in pushing; "the push of the water on the
       walls of the tank"; "the thrust of the jet engines" [syn:
       push, thrust]
    3: enterprising or ambitious drive; "Europeans often laugh at
       American energy" [syn: energy, push, get-up-and-go]
    4: an electrical switch operated by pressing; "the elevator was
       operated by push buttons"; "the push beside the bed operated
       a buzzer at the desk" [syn: push button, push, button]
    5: an effort to advance; "the army made a push toward the sea"
    v 1: move with force, "He pushed the table into a corner" [syn:
         push, force] [ant: draw, force, pull]
    2: press, drive, or impel (someone) to action or completion of
       an action; "He pushed her to finish her doctorate" [syn:
       push, bear on]
    3: make publicity for; try to sell (a product); "The salesman is
       aggressively pushing the new computer model"; "The company is
       heavily advertizing their new laptops" [syn: advertise,
       advertize, promote, push]
    4: strive and make an effort to reach a goal; "She tugged for
       years to make a decent living"; "We have to push a little to
       make the deadline!"; "She is driving away at her doctoral
       thesis" [syn: tug, labor, labour, push, drive]
    5: press against forcefully without moving; "she pushed against
       the wall with all her strength"
    6: approach a certain age or speed; "She is pushing fifty" [syn:
       push, crowd]
    7: exert oneself continuously, vigorously, or obtrusively to
       gain an end or engage in a crusade for a certain cause or
       person; be an advocate for; "The liberal party pushed for
       reforms"; "She is crusading for women's rights"; "The Dean is
       pushing for his favorite candidate" [syn: crusade, fight,
       press, campaign, push, agitate]
    8: sell or promote the sale of (illegal goods such as drugs);
       "The guy hanging around the school is pushing drugs"
    9: move strenuously and with effort; "The crowd pushed forward"
    10: make strenuous pushing movements during birth to expel the
        baby; "`Now push hard,' said the doctor to the woman" [syn:
        press, push]

Moby Thesaurus II by Grady Ward, 1.0:

448 Moby Thesaurus words for "push":
   accelerate, actuate, advance, advance against, advance upon,
   adventuresomeness, adventurousness, advertise, advocate,
   aggrandize, aggravated assault, aggression, aggressiveness,
   ambition, ambitiousness, amperage, amphibious attack,
   apply pressure, armed assault, armipotence, ask, assailing,
   assailment, assault, attack, augment, authority, badger, ballyhoo,
   bang, banzai attack, bear, bear down upon, bear upon, bearing,
   beat it, beef, beef up, beg, beset, besiege, black power,
   black-market, black-marketeer, blandish, blitz, blitzkrieg, boost,
   bootleg, bowl, breakthrough, browbeat, brush aside, brush off,
   brute force, buck, bug, build, bull, bulldoze, bully, bullyrag,
   bump, bump against, bunch, bundle, bunt, burden, bustle, butt,
   butt against, buttonhole, cajole, call on, call upon, campaign,
   charge, charisma, circle, climacteric, clout, clutch, coax, coerce,
   cogence, cogency, compel, compound, compulsion, constrain,
   constraint, continue, convergence of events, counterattack,
   counteroffensive, coup de main, cow, cram, crippling attack,
   crisis, critical juncture, critical point, crossroads, crowd,
   crucial period, crunch, crush, dash, dead set at, deny, depart,
   depress, descent on, determination, die trying, dig, dint,
   dismissal, dispatch, diversion, diversionary attack, domineer,
   dragoon, drive, drive on, driving force, drove, dun, duress,
   dynamism, eagerness, effect, effectiveness, effectuality, effort,
   egg on, elbow, emergency, encourage, energy, enlarge, enterprise,
   enterprisingness, enthusiasm, entreat, exert pressure, exhort,
   exigency, expand, expedite, extremity, fence, fire, flank,
   flank attack, flower power, foray, force, force majeure,
   forcefulness, forge ahead, forward, frontal attack, full blast,
   full force, gas, gas attack, get, get moving, get-up-and-get,
   get-up-and-go, getup, ginger, go, go ahead, go all out, go away,
   go slow, go-ahead, go-getting, go-to-itiveness, goad, group,
   gumption, harass, haste, hasten, hasten on, head, head-on attack,
   hie on, high-pressure, hinge, hit the road, horde, hound, hunch,
   hurry, hurry along, hurry on, hurry up, hurtle, hustle, hustle up,
   hype, impel, impetus, importune, impulse, impulsion, incentive,
   inch forward, incitation, incite, incitement, incursion, induce,
   infiltrate, infiltration, influence, initiative, insist,
   insist upon, instigation, intimidate, invasion, jab, jam, jawbone,
   jog, joggle, jolt, jostle, kick, launch, launch an attack, leave,
   light out, lightning attack, lightning war, lobby, lot, magnify,
   main force, main strength, make, make things hum, mana,
   march against, march upon, mass attack, megadeath, might,
   might and main, mightiness, mobilize, moonshine, motivate,
   motive power, mount an attack, move, moxie, muddle through,
   mugging, multitude, muscle power, nag, nag at, notice, nudge,
   offense, offensive, onset, onslaught, open an offensive,
   overburden, overkill, oversell, overstrain, overtax,
   panzer warfare, pass, pedal, peddle, pep, pepper, persuade, pester,
   pile drive, pinch, piss and vinegar, pizzazz, plague, plead with,
   plug, ply, poke, pole, poop, potence, potency, potentiality, power,
   power pack, power structure, power struggle, powerfulness,
   precipitate, prepotency, press, press forward, press on, pressure,
   proceed, prod, productiveness, productivity, promote, prompt,
   propagandize, propel, propellant, propelling, propelment,
   propulsion, publicize, puff, puissance, pull, pulsion, punch,
   push forward, push off, push on, push through, pushfulness,
   pushiness, pushing, pushingness, quicken, raid, railroad,
   railroad through, ram, ram down, rash impulse, rattle, rebuff,
   recommend, reject, roll, rouse, row, rub, run, run against, run at,
   rush, rush along, sail away, sally, scram, scramble, set,
   set in motion, shake, shock tactics, shoot ahead, shoulder, shove,
   shove off, shoving, shunt, sinew, skedaddle, snap, soft-soap,
   sortie, speed, speed along, speed up, spirit, spunk, spur, squab,
   squash, squeeze, squish, stampede, starch, steam, step lively,
   stimulate, strain, strait, strength, stress, strike, strong arm,
   superiority, superpower, sweep, sweep along, sweet-talk, take off,
   tamp, tax, tease, the boot, the sack, throng, thrust, torment,
   treadle, troll, trundle, try, try again, try and try, try hard,
   turn, turning point, tyrannize, unprovoked assault,
   up-and-comingness, urge, urgency, validity, vehemence,
   venturesomeness, venturousness, verve, vigor, vim, virility,
   virtue, virulence, vitality, walking papers, wattage, weight,
   wheedle, whip, whip along, work on, zeal, zing, zip



The Jargon File (version 4.4.7, 29 Dec 2003):

push


    [from the operation that puts the current information on a stack, and the
    fact that procedure return addresses are saved on a stack] (Also PUSH /push
    / or PUSHJ /push'J/, the latter based on the PDP-10 procedure call
    instruction.)

    1. To put something onto a stack. If one says that something has been
    pushed onto one's stack, it means that the Damoclean list of things hanging
    over ones's head has grown longer and heavier yet. This may also imply that
    one will deal with it before other pending items; otherwise one might say
    that the thing was ?added to my queue?.

    2. vi. To enter upon a digression, to save the current discussion for
    later. Antonym of pop; see also stack.


The Free On-line Dictionary of Computing (30 December 2018):

push

   1.  To put something onto a stack or pdl.

   Opposite: "pop".

   2.  push media.

   [Jargon File]

   (1997-04-10)


The Devil's Dictionary (1881-1906):

PUSH, n.  One of the two things mainly conducive to success,
especially in politics.  The other is Pull.