Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “down”


adjective [after verb] (NOT IN OPERATION)    /daʊn/
C1 (of a system or machine, especially a computer) not in operation or not working, usually only for a limited period of time: The network will be down for an hour for routine maintenance. The whole system's gone down. → See also downtimeComputer conceptsNot functioning
(Definition of down adjective (NOT IN OPERATION) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of down

Definitions of “down” in other dictionaries

Word of the Day


a document given to students or reporters which contains information about a particular subject

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