noun

an act of breaking or failing to observe a law, agreement, or code of conduct.

a breach of confidence

contravention,violation,breaking,non-observance,infringement,transgression,neglect,dereliction,failure to observe,non-compliance with,infraction,delict

verb

make a gap in and break through (a wall, barrier, or defence).

the river breached its bank

break (through),burst (through),rupture,force itself through,split,bust