Definition of infest verb from the Oxford Advanced American Dictionary

 

infest

 verb
verb
NAmE//ɪnˈfɛst//
 
[usually passive]infest somethingVerb Forms present simple I / you / we / they infest
 
he / she / it infests
 
past simple infested
 
-ing form infesting
 
 
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(especially of insects or animals such as rats) to exist in large numbers in a particular place, often causing damage or disease shark-infested waters The kitchen was infested with ants. These parasites infest the gills of freshwater fish.
infestation
 
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NAmE//ˌɪnfɛˈsteɪʃn//
 
noun [countable, uncountable] an infestation of lice Scientists are checking for both insect and fungal infestation.
See the Oxford Advanced Learner's Dictionary entry: infest