The Collaborative International Dictionary of English v.0.48:

Gush \Gush\ (g[u^]sh), v. i. [imp. & p. p. Gushed (g[u^]sht);
   p. pr. & vb. n. Gushing.] [OE. guschen, cf. Icel. gusa and
   gjsa, also D. gucsen; perh. akin to AS. ge['o]tan to pour, G.
   giessen, Goth. giutan, E. gut. Cf. Found to cast.]
   [1913 Webster]
   1. To issue with violence and rapidity, as a fluid; to rush
      forth as a fluid from confinement; to flow copiously.
      [1913 Webster]

            He smote the rock that the waters gushed out. --Ps
                                                  ixxviii 20.
      [1913 Webster]

            A sea of blood gushed from the gaping wound.
                                                  --Spenser.
      [1913 Webster]

   2. To make a sentimental or untimely exhibition of affection;
      to display enthusiasm in a silly, demonstrative manner.
      [Colloq.]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gush \Gush\, v. t.
   1. A sudden and violent issue of a fluid from an inclosed
      plase; an emission of a liquid in a large quantity, and
      with force; the fluid thus emitted; a rapid outpouring of
      anything; as, a gush of song from a bird.
      [1913 Webster]

            The gush of springs,
            An fall of lofty foundains.           --Byron.
      [1913 Webster]

   2. A sentimental exhibition of affection or enthusiasm, etc.;
      effusive display of sentiment. [Collog.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

gush
    n 1: a sudden rapid flow (as of water); "he heard the flush of a
         toilet"; "there was a little gush of blood"; "she attacked
         him with an outpouring of words" [syn: flush, gush,
         outpouring]
    2: an unrestrained expression of emotion [syn: effusion,
       gush, outburst, blowup, ebullition]
    v 1: gush forth in a sudden stream or jet; "water gushed forth"
         [syn: spurt, spirt, gush, spout]
    2: praise enthusiastically; "She raved about that new
       restaurant" [syn: rave, gush]
    3: issue in a jet; come out in a jet; stream or spring forth;
       "Water jetted forth"; "flames were jetting out of the
       building" [syn: jet, gush]

Moby Thesaurus II by Grady Ward, 1.0:

411 Moby Thesaurus words for "gush":
   abound, abundance, access, accession, accretion, accrual,
   accruement, accumulation, addition, advance, affluence, afflux,
   affluxion, aggrandizement, ample sufficiency, ampleness,
   amplification, amplitude, anabasis, appreciation, ascension,
   ascent, augmentation, avalanche, babble, ballooning,
   be enthusiastic, be theatrical, belch, big mouth, blab, blabber,
   blather, blether, bloating, blow out, bob up, bonanza, boom, boost,
   bountifulness, bountiousness, break water, bristle with,
   broadening, bubble over, buildup, bumper crop, burst, candor,
   carry on over, cascade, chat, chatter, clack, clamber, clatter,
   climb, climbing, cloud of words, communicativeness, concourse,
   confluence, conflux, conversableness, copiousness, course,
   crawl with, creep with, crescendo, crosscurrent, current,
   debouchment, defluxion, development, diffuseness, diffusion,
   diffusiveness, discharge, dissiliency, dither, downflow, downpour,
   drain, drain out, drainage, drift, driftage, ebb, edema,
   effervesce, effluence, efflux, effluxion, effusion, effusiveness,
   elevation, emanate, emote, emotionalize, empty, enlargement,
   enthuse, eructation, eruption, escalade, exhalation, exhaust,
   expansion, extension, extravagance, exuberance, exuberate,
   fecundity, fertility, find vent, flare-up, flattering tongue,
   float up, flood, flow, flow back, flow in, flow of words, flow out,
   flowing, flowing tongue, flowoff, fluency, fluent tongue, flush,
   flux, flux de bouche, flux de paroles, flux of words, fly up,
   foison, font, formlessness, fount, fountain, frankness,
   full measure, fullness, gab, gabble, gain, garrulity,
   garrulousness, gas, gassiness, generosity, generousness, geyser,
   gibber, gibble-gabble, gift of gab, glibness, go on, go on over,
   gossip, great abundance, great plenty, greatening, gregariousness,
   growth, gush out, gush over, gushiness, gushing, gyring up,
   ham it up, haver, hike, increase, increment, inflation, inflow,
   insincerity, issue, jabber, jaw, jet, jump, jump up, landslide,
   lavishness, leap, leap up, levitation, liberality, liberalness,
   logorrhea, long-windedness, loose tongue, loquaciousness,
   loquacity, lots, luxuriance, macrology, make, make a scene,
   make much of, maximum, mill run, millrace, more than enough, mount,
   mounting, much, multiplication, myriad, myriads, natter,
   numerousness, oiliness, onrush, onward course, openness, opulence,
   opulency, outbreak, outburst, outfall, outflow, outflowing,
   outpour, outpouring, overflow, palilogy, patter, play, plenitude,
   plenteousness, plentifulness, plenty, pleonasm, pop up, pour,
   pour forth, pour out, prate, prattle, prevalence, prodigality,
   productiveness, productivity, profuseness, profusion, proliferate,
   proliferation, prolificacy, prolificity, prolixity, quantities,
   race, rain, raise, ramble on, rampancy, rankness, rapids, rattle,
   rattle on, rave, rave about, redundancy, reel off, regurgitate,
   reiteration, reiterativeness, repetition for effect,
   repetitiveness, repleteness, repletion, rhapsodize, rich harvest,
   rich vein, richness, riot, riotousness, rise, rising, rocket,
   rocketing up, roll, run, run on, run out, run over, runoff, rush,
   saltation, scads, sentimentalize, set, shoot up, shooting up,
   shower, skyrocket, slobber, slobber over, slop over, sluice,
   sluice out, slush, smarm, snowballing, soaring, sociability, spate,
   spate of words, spew, spew out, spit, spout, spout off, spout out,
   spouter, spray, spread, spring, spring up, spritz, spurt, spurtle,
   squirt, start up, stream, substantiality, substantialness,
   superabundance, superfluity, superflux, surface, surge, surge back,
   swarm with, swelling, take on over, takeoff, taking off, talk away,
   talk nonsense, talk on, talkativeness, tautology, teem, teem with,
   teemingness, that flattering unction, theatricalize, tide, tirade,
   tittle-tattle, torrent, trend, tumescence, twaddle, twattle,
   unction, unctuousness, undercurrent, undertow, up, upclimb,
   upcoming, updraft, upgang, upgo, upgoing, upgrade, upgrowth,
   uphill, upleap, uplift, upping, uprisal, uprise, uprising, uprush,
   upshoot, upslope, upspear, upspring, upstart, upsurge, upsurgence,
   upsweep, upswing, uptrend, upturn, vault, vault up, verbosity,
   volcan, volubility, vomit, vomit forth, vomit out, waffle,
   water flow, waxing, wealth, well, well out, widening, windiness,
   yak, yakkety-yak, zooming