chip in
Pronunciation:
verb
Definitions
To make a contribution; help in a small way; especially, to pay for a part of something.
Example: If we all chip in, we can afford to buy a pizza for lunch.
To contribute.
Example: He chipped in twenty for the retirement gift.
To ante; to put into the pot the amount of chips or money required to continue.
Example: He seemed to hesitate when he chipped in.
To interrupt a discussion for the purpose of making a comment.