Definition of kick in in English:
(Especially of a device or drug) become activated; come into effect.
- I think the medication is finally kicking in and that was what I was waiting for.
- She put her terror to one side as her professional training kicked in and she provided emergency care.
- He is soon feeling sick and unhappy as the effects of his high fat diet kick in.
Definition of kick in in:
- British & World English dictionary