lie through your teeth
US /laɪ θruː jʊər tiːθ/
UK /laɪ θruː jʊər tiːθ/

1.
нагло врать, лгать без зазрения совести
to tell someone something that you know is not true, often in a blatant or unashamed way
:
•
He was lying through his teeth when he said he didn't know anything about the missing money.
Он нагло врал, когда говорил, что ничего не знает о пропавших деньгах.
•
You don't have to lie through your teeth to impress me.
Тебе не нужно нагло врать, чтобы произвести на меня впечатление.