breach
Pronunciation: /briːtʃ/
noun
verb

Phrases
-
breach of the peace
- British public disturbance, or an act considered likely to cause one: a man was convicted of causing a breach of the peace during the demonstration
-
breach of promise
- the action of breaking a sworn assurance to do something, formerly especially to marry someone: Anastasia cherishes the recollection of having won an action for breach of promise
-
step into the breach
- replace someone who is suddenly unable to do a job or task: I can’t think of anyone who could step into the breach should I become ill

Origin:
Middle English: from Old French breche, ultimately of Germanic origin; related to break1

Do not confuse breach with breech. Breach means 'break an agreement or rule' ( they breached the Data Protection Act), 'break through something', or 'a gap', whereas breech means 'the back part of a gun barrel'.