pinch hitter

pinch hitter idiom
A substitute for another person, especially in an emergency. For example, Pat expected her mother to help with the baby, but just in case, she lined up her mother-in-law as pinch hitter. This expression comes from baseball, where it is used for a player substituting for another at bat at a critical point or in a tight situation (called a pinch since the late 1400s). [Late 1800s]

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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