WordNet (r) 3.0 (2006):

bottle up
    v 1: control and refrain from showing; of emotions, desires,
         impulses, or behavior [syn: inhibit, bottle up,
         suppress]

Moby Thesaurus II by Grady Ward, 1.0:

137 Moby Thesaurus words for "bottle up":
   arrest, asphyxiate, bosom, box in, box up, bury, cabin, cache,
   cage, casket, censor, check, choke off, clamp down on, cloister,
   closet, coffin, confine, constrain, coop, coop in, coop up, cork,
   cork up, countercheck, crack down on, cramp, crib, crush, curb,
   dam up, damp, damp down, dampen, delay, deposit, detain, drown,
   embosom, encage, encase, enclose, entomb, extinguish, fence in,
   file and forget, gag, hem in, hide away, hinder, hold, hold back,
   hold down, hold in, hold in check, hold in custody,
   hold in restraint, hold up, immure, impede, impound, inhibit,
   intercept, interfere, intermeddle, interrupt, intervene, jump on,
   keep, keep back, keep down, keep hidden, keep in, keep in check,
   keep in custody, keep in detention, keep secret, keep under, kill,
   lock in, lock up, maintain, meddle, mew, mew up, muzzle, oppose,
   pen, pen up, plant, pound, pour water on, preserve, put away,
   put down, quash, quell, quench, rail in, repress, resist, restrain,
   restrict, retain, retard, save, save up, scotch, seal up, secrete,
   set back, shackle, shut down on, shut in, shut up, silence,
   sit down on, sit on, slacken, smash, smother, snub, squash,
   squelch, stanch, stash, stifle, store away, stow away, straiten,
   strangle, stultify, subdue, suffocate, suppress, throttle,
   wall in