chip in
»She took ‘the liberty of chipping in’, to use her own expression.» (They And I. 226. 6.)
An actress.
= of joining in the conversation.
To chip in is sport-slang (Cards) for »to put a chip (or counter) in the pool»; hence, by extension, to make a contribution to, or take part in, anything—e. g. a conversation or an enterprise.