Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “infest”


verb [T]     /ɪnˈfest/
If insects , animals , weeds (= plants you do not want ), etc infest a place , they cause problems by being there in large numbers : [often passive] The hotel was infested with cockroaches .Passing on illness and causing disease
(Definition of infest verb from the Cambridge Learner's Dictionary © Cambridge University Press)

Definitions of “infest” in other dictionaries

Word of the Day


a situation in which two people are friends

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