chip in

Short definition from Wiktionary

Verb

1. 1
   To make a contribution; help in a small way; especially, to pay for a part of something.
2. 2
   To make a contribution; help in a small way; especially, to pay for a part of something: To contribute (for, to, or toward something).
3. 3
   To contribute (something).
4. 4
   To ante; to put into the pot the amount of chips or money required to continue.
5. 5
   To interrupt a discussion for the purpose of making a comment.
6. 6
   To put a chip shot in the hole.
7. 7
   To join in (something); to butt in or contribute (something) to a conversation; to say (something).