1 [uncountable and countable]
an action that breaks a law, rule, or agreement
This was a clear breach of the 1994 Trade Agreement.
They sued the company for breach of contract.
a breach of professional duty
be in breach of something
He was clearly in breach of the law.
a serious disagreement between people, groups, or countries
Britain did not want to risk a breach with the US over sanctions.
What had caused the sudden breach between Henry and his son?
She wanted to help heal the breach between them.
an action in which someone does something that people have trusted them not to do:
We regard the publication of this information as a serious breach of trust.
an action in which someone manages to learn secret information or manages to get into a place that is guarded:
There had been a major breach of security at the air base.
5 British English
the crime of making too much noise or fighting in a public place:
He was arrested and charged with breach of the peace.
a hole made in a wall that is intended to protect a place
a breach in the castle wall
to help by doing someone else's job or work when they are unable to do it [= step in]:
Thanks for stepping into the breach last week.