Word Origin See more synonyms on Thesaurus.com a man's hat, worn especially in the 18th century, having a wide, stiff brim turned up on two or three sides toward a peaked crown. Compare bicorne, tricorn. (def 2) knock into a cocked hat, . Informal to destroy completely; render unachievable.
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for knock into a cocked hat a hat with opposing brims turned up and caught together in order to give two points (bicorn) or three points (tricorn) knock into a cocked hat slang to outdo or defeat
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Idioms and Phrases with knock into a cocked hat knock into a cocked hat
Debunk, render useless or unbelievable. For example,
His findings knocked our theory into a cocked hat. This expression alludes to a style of hat with the brim turned up on three sides—the three-cornered (tricorne) hat worn by officers in the American Revolution—giving it a distorted look. [Early 1800s]
The American Heritage® Idioms Dictionary
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