WordNet (r) 3.0 (2006):

bottom out
    v 1: reach the low point; "Prices bottomed out and started to
         rise again after a while" [ant: peak, top out]
    2: hit the ground; "the car bottomed out where the driveway
       meets the road"

Moby Thesaurus II by Grady Ward, 1.0:

40 Moby Thesaurus words for "bottom out":
   alter, ameliorate, be changed, be converted into, be renewed,
   break, change, checker, chop, chop and change, come about,
   come around, come round, degenerate, deteriorate, deviate, diverge,
   diversify, flop, haul around, improve, jibe, meliorate, mitigate,
   modulate, mutate, revive, shift, swerve, tack, take a turn, turn,
   turn aside, turn into, turn the corner, undergo a change, vary,
   veer, warp, worsen