( informal )
1.
to join in or interrupt a conversation; to add sth to a conversation or discussion :
Pete and Anne chipped in with suggestions.
[+ speech ]
'That's different,' she chipped in.
2.
(also ˌchip ˈin 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.