1. to join in or interrupt a conversation; to add sth to a conversation or discussion

Pete and Anne chipped in with suggestions.

'That's different', she chipped in.

2. (also chip in sth) to give some money so that a group of people can buy sth together.

Syn: contribute

If everyone chips in, we'll be able to buy her a really nice present.

We each chipped in (with) £5.

I am happy to chip in up to £100 from budget Hermjakob.