pitch in

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

1. (transitive, intransitive, 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.

   • 2008 October, Davy Rothbart, “How I caught up with dad”, in Men's Health, volume 23, number 8, →ISSN, page 112:

     He spent 20 minutes one afternoon describing the club he'd formed with other teenagers in his Brooklyn neighborhood. They'd each pitched in a buck a month to rent the basement of a mallet factory, which they used as a clubhouse.

2. (intransitive) To begin briskly.

• chip in
• kick in (esp. financially)
• muck in

• pitch into

• do one's bit