›an act of breaking a law, promise, agreement, or relationship: They felt that our discussions with other companies constituted a breach of/in our agreement.He was sued for breach of contract.There have been serious security breaches (= breaks in our security system).Obeying and breaking the lawObedient and compliantDisobedientBad and wrong behaviourMaking and breaking promises and commitments(a) breach of the peacelegal›(an example of) illegal noisy or violent behaviour in a public placeSocial order and disorderbe in breach of sthformal›to be breaking a particular law or rule: The cinema was in breach of the Health and Safety Act for having no fire doors.Obeying and breaking the lawObedient and compliantDisobedientBad and wrong behaviour