I. transitive verb
slang : contribute
asked to kick a dollar in for a present for the boss
intransitive verb
1. slang : die
kicked in at the ripe old age of 90
2. slang : to make a contribution
an unknown contributor kicked in with $1000
II. intransitive verb
: to begin operating or having an effect : get started
waiting for the heater to kick in
a new tax kicking in next year