WordNet (r) 3.0 (2006):

stir up
    v 1: try to stir up public opinion [syn: agitate, foment,
         stir up]
    2: arouse or excite feelings and passions; "The ostentatious way
       of living of the rich ignites the hatred of the poor"; "The
       refugees' fate stirred up compassion around the world"; "Wake
       old feelings of hatred" [syn: inflame, stir up, wake,
       ignite, heat, fire up]
    3: change the arrangement or position of [syn: agitate, vex,
       disturb, commove, shake up, stir up, raise up]
    4: provoke or stir up; "incite a riot"; "set off great unrest
       among the people" [syn: incite, instigate, set off,
       stir up]

Moby Thesaurus II by Grady Ward, 1.0:

148 Moby Thesaurus words for "stir up":
   abet, admix, aggravate, agitate, alloy, amalgamate, annoy, arouse,
   awake, awaken, beat, beat up, bemingle, blend, blow the coals,
   blow up, bristle, call forth, call up, chafe, churn, churn up,
   coalesce, combine, commingle, commix, compose, compound, concoct,
   conglomerate, convulse, disarrange, discompose, disquiet, disturb,
   embitter, emulsify, enkindle, enrage, exasperate, excite, fan,
   fan the fire, fan the flame, feed the fire, ferment, fire, flame,
   flurry, foment, frenzy, fret, fuse, hash, heat, heat up,
   homogenize, huff, immingle, immix, impassion, incense, incite,
   inflame, infuriate, instigate, integrate, interblend, interlace,
   interlard, intermingle, intermix, intertwine, interweave, irritate,
   jumble, key up, kindle, knead, lather up, light the fuse, light up,
   madden, merge, miff, mingle, mingle-mangle, mix, mix up, move,
   nettle, overexcite, paddle, peeve, perturb, perturbate, pique,
   provoke, put up to, raise, raise up, rally, rankle, rile, ripple,
   roil, roughen, rouse, ruffle, rumple, scramble, set, set astir,
   set fire to, set on, set on fire, set up, shake, shake up, shuffle,
   sic on, steam up, stir, stir the blood, stir the embers,
   stir the feelings, summon up, swirl, syncretize, throw together,
   tickle, toss together, trouble, turn on, upset, vex, wake, wake up,
   waken, warm, warm the blood, whet, whip, whip up, whisk, work,
   work into, work up