throw down the gauntlet
Idioms
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Declare or issue a challenge, as in The senator threw down the gauntlet on the abortion issue. This expression alludes to the medieval practice of a knight throwing down his gauntlet, or metal glove, as a challenge to combat. Its figurative use dates from the second half of the 1700s, as does the less frequently heard take up the gauntlet, for accepting a challenge.
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.
