pitch in

pitch in idiom
  1. Set to work vigorously, as in We pitched right in and started mowing the field. [Colloquial; second half of 1800s]
  2. Join forces with others; help, cooperate. For example, We were hoping you'd pitch in and sort the books. Also see pitch into.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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