The Collaborative International Dictionary of English v.0.48:

Urge \Urge\, v. i.
   1. To press onward or forward. [R.]
      [1913 Webster]

   2. To be pressing in argument; to insist; to persist.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Urge \Urge\, v. t. [imp. & p. p. Urged; p. pr. & vb. n.
   Urging.] [L. urgere; akin to E. wreak. See Wreak, v. t.]
   [1913 Webster]
   1. To press; to push; to drive; to impel; to force onward.
      [1913 Webster]

            Through the thick deserts headlong urged his flight.
                                                  --Pope.
      [1913 Webster]

   2. To press the mind or will of; to ply with motives,
      arguments, persuasion, or importunity.
      [1913 Webster]

            My brother never
            Did urge me in his act; I did inquire it. --Shak.
      [1913 Webster]

   3. To provoke; to exasperate. [R.]
      [1913 Webster]

            Urge not my father's anger.           --Shak.
      [1913 Webster]

   4. To press hard upon; to follow closely
      [1913 Webster]

            Heir urges heir, like wave impelling wave. --Pope.
      [1913 Webster]

   5. To present in an urgent manner; to press upon attention;
      to insist upon; as, to urge an argument; to urge the
      necessity of a case.
      [1913 Webster]

   6. To treat with forcible means; to take severe or violent
      measures with; as, to urge an ore with intense heat.
      [1913 Webster]

   Syn: To animate; incite; impel; instigate; stimulate;
        encourage.
        [1913 Webster]

WordNet (r) 3.0 (2006):

urge
    n 1: an instinctive motive; "profound religious impulses" [syn:
         urge, impulse]
    2: a strong restless desire; "why this urge to travel?" [syn:
       urge, itch]
    v 1: force or impel in an indicated direction; "I urged him to
         finish his studies" [syn: urge, urge on, press,
         exhort]
    2: push for something; "The travel agent recommended strongly
       that we not travel on Thanksgiving Day" [syn: recommend,
       urge, advocate]
    3: spur on or encourage especially by cheers and shouts; "The
       crowd cheered the demonstrating strikers" [syn: cheer,
       root on, inspire, urge, barrack, urge on, exhort,
       pep up]

Moby Thesaurus II by Grady Ward, 1.0:

197 Moby Thesaurus words for "urge":
   accelerate, admonish, advise, advocate, affirm, allege, appetite,
   appetition, apply pressure, ardor, argue, ask, assert,
   automatic response, beg, beseech, beset, besiege, blandish,
   blind impulse, brain wave, brainstorm, brook no denial, bug,
   bundle, bustle, buttonhole, cajole, call on, call upon, caution,
   charge, cheer on, coax, compulsion, concupiscence, constrain,
   constraint, contend, counsel, craving, crowd, curiosity, demand,
   desideration, desire, dispatch, drive, drive on, dun, eagerness,
   egg on, encourage, enjoin, entreat, exert pressure, exhort,
   exigency, expedite, expostulate, fancy, fantasy, flash,
   fleeting impulse, force, forward, goad, goad on, gut response,
   haste, hasten, hasten on, hie on, high-pressure, hold, hope, horme,
   hound on, hunger, hurry, hurry along, hurry on, hurry up, hustle,
   hustle up, impel, impetus, importune, impulse, impulsion,
   incentive, incite, induce, influence, insist, insist on,
   insist upon, inspiration, instinct, intellectual curiosity,
   involuntary impulse, issue a caveat, itch, jawbone, libido, lobby,
   longing, lust, lust for learning, maintain, mind, motive, move,
   nag, nag at, natural impulse, need, needle, notion, passion,
   persist, persuade, pester, pinch, plague, plead with, pleasure,
   pleasure principle, ply, preach, precipitate, press, pressure,
   prevail upon, prick, prod, prompt, propel, provoke, push, push on,
   push through, quick hunch, quicken, railroad through, rash impulse,
   recommend, reflex, remonstrate, request, root on, rush, rush along,
   set forth, set on, sexual desire, shove, sic, soft-soap, solicit,
   speed, speed along, speed on, speed up, spring, spur, spur on,
   stampede, stand on, state, stick to, stress, sudden thought,
   suggest, sway, sweet-talk, take no denial, talk into, tease,
   thirst, thirst for knowledge, urge on, urgency, want, wanting,
   warn, wheedle, whip, whip along, whip on, will, will and pleasure,
   wish, wish fulfillment, work on, yearning, yen