English Reference

Word

breach

US/ˈbɹitʃ/

UK/bɹˈiːtʃ/

Definitions

01breaking a rule or law

C1 · 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.

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

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

Formal

Usage

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

02security failure

B2 · 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.

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

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

Synonyms

03a physical gap

C1

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.

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

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

Literary

05whale jumping

C2

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.

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

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

Technical

Synonyms

Real-World Examples

“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
“The visits prompted officials to report a security breach.”
The Guardian · 13 Aug 2026
“It will come out, but I just dare not breach that trust and confidence with counter-terrorism at this stage.”
The Guardian · 10 Aug 2026

Etymology

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.

Collocations

breach of trustbreach of the court

Idioms

honor in the breach — To demonstrate (a rule, law, or policy) by breaking or breaching it.

Domains

ComputingLawNautical

This entry

Level
C1 · Advanced
Frequency
Common
Updated

Scan code

englishreference.com/q/breach

English Reference