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English definition of “infest”

infest

verb [T] uk   /ɪnˈfest/ us  
(of animals and insects that carry disease) to cause a problem by being present in large numbers: The barn was infested with rats.Passing on illness and causing disease
infestation
noun [C or U] uk   /ˌɪn.fesˈteɪ.ʃən/ us  
a flea infestation an infestation of cockroaches/head licePassing on illness and causing disease
(Definition of infest from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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