(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.verbjump to other results
NAmE//ɪnˈfɛst//[usually passive] infest somethingVerb Forms present simple I / you / we / they infest
he / she / it infests
past simple infested
-ing form infesting
infestationjump to other results
NAmE//ˌɪnfɛˈsteɪʃn//noun [countable, uncountable] an infestation of lice Scientists are checking for both insect and fungal infestation.