ㄨㄟˊwéiㄩㄝyuē

  1. 違背條約契約規定史記··項羽本紀·索隱》:違約關懷。」背信背約踐約守約

to break a promise, to violate an agreement, to default (on a loan or contract)​
manquer à ses engagements
Vertragsverletzung (S)​