WordNet (r) 3.0 (2006):

get in
    v 1: to come or go into; "the boat entered an area of shallow
         marshes" [syn: enter, come in, get into, get in,
         go into, go in, move into] [ant: exit, get out,
         go out, leave]
    2: succeed in a big way; get to the top; "After he published his
       book, he had arrived"; "I don't know whether I can make it in
       science!"; "You will go far, my boy!" [syn: arrive, make
       it, get in, go far]
    3: secure a place in a college, university, etc. [syn: get in,
       get into]
    4: of trains; move into (a station); "The bullet train drew into
       Tokyo Station" [syn: pull in, get in, move in, draw
       in] [ant: get out, pull out]

Moby Thesaurus II by Grady Ward, 1.0:

150 Moby Thesaurus words for "get in":
   accomplish, accumulate, achieve, admit, agglomerate, aggregate,
   aggroup, amass, approach, arrive, arrive at, arrive in, assemble,
   attain, attain to, back, barge in, batch, be admitted, be received,
   bestraddle, bestride, blow in, board, bob up, break in, breeze in,
   bring together, bulk, bunch, bunch together, bunch up, burst in,
   bust in, check in, climb on, clock in, clump, cluster, collect,
   colligate, collocate, combine, come, come barging in,
   come breezing in, come busting in, come in, come to, come to hand,
   compare, compile, conglomerate, corral, creep in,
   cross the threshold, crowd in, cull, cumulate, dig up,
   draw together, dredge up, drive together, drop in, edge in, enter,
   fetch, fetch up at, find, gain, gain admittance, gather, gather in,
   gather together, get, get on, get there, get to, get together,
   glean, go aboard, go in, go into, go on board, group, grub,
   grub up, have an entree, have an in, hit, hit town, hop in, insert,
   intrude, irrupt, jam in, join, jump in, juxtapose, look in,
   lump together, make, make it, make up, mass, match, mobilize,
   mount, muster, pack in, pair, partner, pick, pick up, pile in,
   pluck, pop in, pop up, press in, pull in, punch in, push in,
   put in, put together, raise, rake up, rally, reach, ring in,
   roll in, round up, scare up, scrape together, scrape up,
   set foot in, show, show up, sign in, slip in, squeeze in, step in,
   take in, take up, thrust in, time in, turn up, visit, wedge in,
   whip in, work in