Also means
to reveal, to give away
Usage Note
Trahir means to betray a person or a cause, but it also carries the softer sense of inadvertently revealing something — son accent le trahit ('his accent gives him away'). The related noun la trahison means betrayal or treason. It is a regular -ir verb conjugated like finir.
Examples
"Elle a trahi la confiance de ses amis."
Natural Translation
She betrayed the trust of her friends.

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