Source : WordNet®

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}]
     2: contribute to some cause; "I gave at the office" [syn: {contribute},
         {give}, {chip in}]
     3: open violently; "kick in the doors" [syn: {kick down}]