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]