Definition of breach – an act of breaking or failing to observe a law, agreement, or code of conduct, a gap in a wall, barrier, or defence, …

An act of breaking a law, promise, agreement, or relationship:

They felt that our discussions with other companies constituted a breach of/in our agreement.

An infraction or violation, as of a law, trust, faith, or promise.

a gap made in a wall, fortification, line of soldiers, etc.; rift; fissure.

verb (used with object)
to make a breach or opening in.

to break or act contrary to (a law, promise, etc.).

The wall of the city of Jerusalem was breached by the Babylonians, and the Romans also did the same thing in the month of Tamuz (during the season in which Israel mourns for three weeks).