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. 他因叛国罪受到惩罚。 Rumours of treachery and conspiracy began to circulate in the Queen’s court. 背叛和阴谋的谣言开始在女王的宫廷中流传。
Word OriginMiddle English: from Old French trecherie, from trechier ‘to cheat’.