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4-F

American  
[fawr-ef, fohr-] / ˈfɔrˈɛf, ˈfoʊr- /

noun

  1. a U.S. Selective Service classification designating a person considered physically, psychologically, or morally unfit for military duty.

  2. a person so classified.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.