- 1breach something to not keep to an agreement or not keep a promise synonym break The government is accused of breaching the terms of the treaty.
- 2breach something to make a hole in a wall, fence, etc. so that someone or something can go through it The dam had been breached. Demonstrators breached police lines around the embassy.
NAmE//britʃ//Verb Forms present simple I / you / we / they breach
he / she / it breaches
past simple breached
-ing form breaching