Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “breach”


noun [C]  /britʃ/ us  

breach noun [C] (BREAK)

an act of breaking a rule, law, custom, or practice: In a breach of security, unauthorized people were able to board the plane.

breach noun [C] (OPENING)

an opening in a wall or fence or in a line of military defense
verb [T]  /britʃ/ us  
The river breached the dams.
(Definition of breach from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of breach?
Browse related topics

You are looking at an entry to do with Making holes in things, but you might be interested in these topics from the Cutting and joining topic area:

Add Cambridge dictionaries to your browser to your website

Definitions of “breach” in other dictionaries

Word of the Day


to send something through the air with force, especially by a sudden movement of the arm

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More