Synonymer till breachsubstantiv(a failure to perform some promised act or obligation) breach(an opening (especially a gap in a dike or fortification)) breach(a personal or social separation (as between opposing factions)) rupture; break; severance; rift; falling out; breachverb(act in disregard of laws, rules, contracts, or promises) transgress; offend; infract; violate; go against; break; breach(make an opening or gap in) gap; breach