Usage Note
Trahison covers both high treason against a state and personal betrayal in a relationship or friendship. Haute trahison is high treason. The verb is trahir and the agent noun is traître/traîtresse. The phrase c'est une trahison can be said of anything felt as a deep let-down.
Examples
"Il a été accusé de trahison."
Natural Translation
He was accused of treason.

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