betrays, gives away
L'empreinte qu'il a laissée sous le lit le trahit.
The footprint he left under the bed gives him away.
— Detective Chinatown (2015)
Son accent le trahit dès qu'il ouvre la bouche.
His accent gives him away as soon as he opens his mouth.
Tom trahit Marie.
Tom betrays Mary.
Qui me trahit est un homme mort.
Whoever betrays me is a dead man.
— Les Larmes du tigre noir (2000)
On ne trahit plus personne, maintenant.
We don't betray anyone anymore, now.
— Amours chiennes (2000)
Tout ce que tu fais trahit tes origines.
Everything you do betrays your origins.
— The Mermaid (2016)