WordNet (r) 3.0 (2006):

turn up
    v 1: appear or become visible; make a showing; "She turned up at
         the funeral"; "I hope the list key is going to surface
         again" [syn: come on, come out, turn up, surface,
         show up]
    2: bend or lay so that one part covers the other; "fold up the
       newspaper"; "turn up your collar" [syn: fold, fold up,
       turn up] [ant: open, spread, spread out, unfold]
    3: discover the location of; determine the place of; find by
       searching or examining; "Can you locate your cousins in the
       Midwest?"; "My search turned up nothing" [syn: locate,
       turn up]
    4: be shown or be found to be; "She proved to be right"; "The
       medicine turned out to save her life"; "She turned up HIV
       positive" [syn: prove, turn out, turn up]
    5: find by digging in the ground; "I dug up an old box in the
       garden" [syn: excavate, dig up, turn up]

Moby Thesaurus II by Grady Ward, 1.0:

141 Moby Thesaurus words for "turn up":
   abandon, accomplish, achieve, appear, appear unexpectedly,
   approach, arise, arrive, arrive at, arrive in, assister, attain,
   attain to, attend, be at, be found, be present at, be received,
   be unexpected, bechance, become manifest, become visible, befall,
   betide, betray itself, blow in, bob up, bring to light, catch,
   cede, chance, check in, clock in, cock up, come, come across,
   come along, come forth, come forward, come in, come in sight,
   come into being, come into existence, come on, come out, come to,
   come to hand, come to light, come unawares, come upon, creep up on,
   crop out, crop up, descry, detect, dig up, disclose,
   discover itself, disinter, do, draw on, emerge, encounter, enter,
   espy, excavate, exhume, expose, fade in, fall upon, ferret out,
   fetch, fetch up at, find, fish up, flash upon one, gain, get in,
   get there, get to, give up, go to, hand, hang out, hap, happen,
   happen along, happen by chance, hazard, heave in sight, hit,
   hit town, issue, issue forth, look forth, look on, loom, make,
   make it, materialize, meet with, outcrop, peep out, pop up,
   pounce upon, present itself, pull in, punch in, reach,
   rear its head, reveal, ring in, rise, roll in, root up, see,
   see the light, show, show up, sign in, sit in, slope up, spot,
   spring up, stream forth, strike the eye, take in, time in,
   track down, trend upwards, uncover, unearth, upbend, upcast,
   upcurve, upsweep, upturn, visit, watch, witness, worm out