go to bat for

go to bat for idiom
Take the side of, support, defend. For example, Dad will always go to bat for his kids. This term originated in baseball, where it means simply substituting for another batter, but it is the idea of helping one's team in this way that has been transferred to more general use. [Slang; early 1900s]

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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