fighting words

fighting words idiom
A statement bound to start a quarrel or fight. It is often expressed as them's fighting words, as in You say your father's smarter than mine? Them's fighting words. The ungrammatical use of them's for “those are” emphasizes the folksy tone of this colloquialism, first recorded in Ring Lardner's Gullible's Travels (1917).

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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