Meaning of “infest” in the English Dictionary

"infest" in British English

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infestverb [ T ]

uk /ɪnˈfest/ us /ɪnˈfest/

(of animals and insects that carry disease) to cause a problem by being present in large numbers:

The barn was infested with rats.
infestation
noun [ C or U ] uk /ˌɪn.fesˈteɪ.ʃən/ us /ˌɪn.fesˈteɪ.ʃən/

a flea infestation
an infestation of cockroaches/head lice

(Definition of “infest” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"infest" in American English

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infestverb [ T ]

us /ɪnˈfest/

(of insects and some animals) to be present in large numbers, sometimes causing disease or damage:

When we first moved in, the apartment was infested with cockroaches.

(Definition of “infest” from the Cambridge Academic Content Dictionary © Cambridge University Press)