Nouns

(n)breacha failure to perform some promised act or obligation
(n)breachan opening (especially a gap in a dike or fortification)
(n)rupture, breach, break, severance, rift, falling outa personal or social separation (as between opposing factions)“they hoped to avoid a break in relations”

Verbs

(v)transgress, offend, infract, violate, go against, breach, breakact in disregard of laws, rules, contracts, or promises“offend all laws of humanity”, “violate the basic laws or human civilization”, “break a law”, “break a promise”
(v)gap, breachmake an opening or gap in