in there pitching
Exerting one's best effort, trying actively. For example, After the flood, everyone was in there pitching to clean up the streets. This metaphor alludes to the pitcher's important role in baseball. [Colloquial; c. 1940]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.