Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “bug”


noun [C] (FAULT)   /bʌɡ/
a mistake or problem in the way something works : He said they had eliminated all the bugs in the software , and we hoped this was true .
(Definition of bug noun (FAULT) from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on the pronunciation of bug

Definitions of “bug” in other dictionaries

Word of the Day


to pour liquid slowly over something, especially in a thin line or in small drops

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