裏うら切ぎり行こう為い

noun

act of betrayal; treachery; double-cross

Refers to a concrete act of betraying trust, such as breaking a promise, revealing secrets, or turning against an ally.

• 彼かれの裏うら切ぎり行こう為いは許ゆるせない。

  I cannot forgive his act of betrayal.

• その裏うら切ぎり行こう為いによって、同どう盟めいは崩ほう壊かいした。

  The alliance collapsed because of that act of treachery.