Meaning of “chip in” - Learner’s Dictionary

chip in

informal phrasal verb with chip uk us /tʃɪp/ verb [ T ] (present participle chipping, past tense and past participle chipped)

to interrupt a conversation in order to say something:

I'll start and you can all chip in with your comments.

(Definition of “chip in” from the Cambridge Learner’s Dictionary © Cambridge University Press)