kick in

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb transitive To kick or strike so as to cause the object struck to collapse or fall inwards.
• verb intransitive, idiomatic To start or connect suddenly.
• verb transitive and intransitive, idiomatic To contribute, especially to a collection of money.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb open violently
• verb enter a particular state
• verb contribute to some cause