0 to start to do something as part of a group, especially something helpful: --
After we had seen the video everyone started pitching in with comments on its faults.
My brother pitched in with an offer of help.
[ + to infinitive ] When I bought this house, all my friends pitched in to help fix it up.
If we all pitch in together, it shouldn't take too long.
1 to become involved in esp. something helpful: --
If we all pitch in, the cleanup shouldn’t take long.
NYA ORD
European
May 10, 2021
DAGENS ORD
Shimmer
pitch in