lie through one's teeth(redirected from lie in one's teeth)
lie through (one's) teeth
To lie brazenly and unabashedly. Stop lying through your teeth—we have evidence that you were here the night of the crime.
lie through one's teeth
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]