breach - noun

a failure to perform some promised act or obligation

an opening (especially a gap in a dike or fortification)

a personal or social separation (as between opposing factions)

breach - verb

• act in disregard of laws, rules, contracts, or promises
• make an opening or gap in

breach - thesaurus

break   gap   infract   offend   rift   rupture   severance   transgress   violate