WordNet (r) 3.0 (2006):

wear thin
    v 1: deteriorate through use or stress; "The constant friction
         wore out the cloth" [syn: wear, wear off, wear out,
         wear down, wear thin]

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "wear thin":
   bomb, break, cave in, collapse, come apart, come unstuck, conk out,
   crumble, decline, disintegrate, droop, drop, fade, fail, faint,
   fall flat, fizzle out, flag, give out, give way, go downhill,
   go soft, go to pieces, hit the skids, languish, peg out, peter out,
   pine, poop out, sink, weaken, wear away, wilt, yield