Usage Note
Mentir is an irregular -ir verb: je mens, tu mens, il ment — no 't' is added in the third person since it's already in the stem. The noun un mensonge (a lie) and un menteur / une menteuse (a liar) come from the same root. Mentir comme un arracheur de dents (to lie like a tooth-puller) is a colourful idiom for compulsive lying.
Examples
"Elle ne ment jamais à ses amis."
Natural Translation
She never lies to her friends.

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