WordNet (r) 3.0 (2006):

kick in
    v 1: enter a particular state; "Laziness set in"; "After a few
         moments, the effects of the drug kicked in" [syn: set in,
         kick in]
    2: contribute to some cause; "I gave at the office" [syn:
       contribute, give, chip in, kick in]
    3: open violently; "kick in the doors" [syn: kick in, kick
       down]

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "kick in":
   buy it, cash in, check in, check out, chip in, come, come across,
   come across with, come down with, come through with, contribute,
   contribute to, cough up, croak, donate to, drop off, fork over,
   gift, gift with, give to, go west, grease the palm, have it,
   kick off, kick the bucket, knock off, lay on one, pass out,
   peg out, pipe off, pledge, plunk down, pony up, pop off, post,
   shove off, step off, stump up, subscribe, sweeten the kitty,
   tickle the palm