pitch in

pitch in (third-person singular simple present pitches in, present participle pitching in, simple past and past participle pitched in)

1. (idiomatic) To help out; lend assistance; contribute; to do one's part to help.

   If we all pitch in, we can raise enough money for the renovation of the church.

2. To begin briskly.

• chip in
• muck in

• pitch into