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lie through one's teeth

Idioms

Also, lie in one's teeth. Utter outrageous falsehoods, as in He was lying through his teeth when he said he'd never seen her before; they've known each other for years. This expression presumably alludes to a particular facial grimace one assumes when lying. [c. 1300]

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