breach

nouns

a failure to perform some promised act or obligation
breach
is a type of (narrower)
an unexpected omission
"he resented my failure to return his call"; "the mechanic's failure to check the brakes"
failure
an opening (especially a gap in a dike or fortification)
breach
is a type of (narrower)
an open or empty space in or between things
"there was a small opening between the trees"; "the explosion made a gap in the wall"
gap, opening
a personal or social separation (as between opposing factions)
"they hoped to avoid a break in relations"
breach, break, falling out, rift, rupture, severance

verbs

act 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"
breach, break, go against, infract, offend, transgress, violate
make an opening or gap in
breach, gap