(also in there or right there or right in there) Making a great effort; coping energetically and successfully; on top of: I'm on the go night and day, and I'm in there pitching/ When they needed a strong guide, he was in there(1940s+)
The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source
Idioms and Phrases with in there pitching
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.
[ ; c. 1940