English Reference
noun · verb

breach

n. · v.
US /ˈbɹitʃ/ UK /bɹˈiːtʃ/ breach UK spelling breached, breaches, breaching

  1. 01 C1 Advanced Formal Law

    n.an act of breaking a law, promise, or agreement.

    n.an infraction or violation of a legal obligation, contract, or code of conduct.

    Simple

    The company was sued for a breach of contract after they failed to deliver the goods.

    In context

    The legal team argued that the disclosure of confidential documents constituted a material breach of the non-disclosure agreement signed last year.

    Usage

    Often used in the phrase 'breach of contract' or 'breach of trust'.

  2. 02 B2 Upper Intermediate Computing

    n.an event where a computer system is entered without permission.

    n.an incident in which sensitive, protected, or confidential data is accessed or stolen by an unauthorised person.

    Simple

    The bank notified its customers about a data breach that exposed their credit card numbers.

    In context

    Following the massive security breach, the IT department implemented multi-factor authentication across all internal servers to prevent future intrusions.

  3. 03 C1 Advanced Literary

    n.a hole or opening made in a wall, fence, or defensive line.

    n.a physical gap or opening created by force in a fortification, wall, or barrier.

    Simple

    The soldiers managed to climb through a breach in the castle wall.

    In context

    Floodwaters poured through a narrow breach in the levee, threatening to submerge the low-lying farmland within hours.

  4. 04 C2 Proficiency Technical

    v.when a whale or dolphin leaps out of the water.

    v.to leap clear of the water, typically said of whales or other large marine mammals.

    Simple

    We were lucky to see a humpback whale breach right next to our boat.

    In context

    Marine biologists observed the pod for several hours, recording the frequency with which the younger males would breach during the mating season.

Usage breach of trust · breach of the court

Senior Principal Veterinary Officer Elsie McGarvey said the department was "technically" potentially in breach of the court order by extending the grace period.

BBC News· 14 Aug 2026

NHSBT acknowledged this was a data breach, after being alerted by the BBC.

BBC News· 14 Aug 2026

From Middle English breche, from Old English bryċe (“fracture, breach”) and brǣċ (“breach, breaking, destruction”), from Proto-West Germanic bruki, from Proto-Germanic brukiz (“breach, fissure”) and *brēkō (“breaking”).

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin gem-pro *brukiz
Level C1 · Advanced
Frequency Common
Updated