behaviour that involves hurting somebody who trusts you, for example by telling their secrets to other people; an example of this 背叛；变节；背信弃义 an act of treachery 背叛行为 He was punished for his treacheries. 他因行事方式受到惩罚。 Rumours of treachery and conspiracy began to circulate in the Queen’s court. 叛国和阴谋的谣言开始在皇后宫廷流传。
Word OriginMiddle English: from Old French trecherie, from trechier ‘to cheat’.