INFEST definition: to live in or overrun to an unwanted degree or in a troublesome manner, especially as predatory animals or vermin do. See examples of infest used in a sentence.

The meaning of INFEST is to spread or swarm in or over in a troublesome manner. How to use infest in a sentence.

INFEST definition: 1. (of animals, insects) to cause a problem by being present in large numbers, spreading disease or…. Learn more.

To inhabit or overrun in numbers or quantities large enough to be harmful, threatening, or obnoxious: rats infesting the sewers; streets that were infested with drugs. 2. To live as a …

Dec 23, 2025 · infest (third-person singular simple present infests, present participle infesting, simple past and past participle infested) (transitive) To inhabit a place in unpleasantly large …

When creatures such as insects or rats infest plants or a place, they are present in large numbers and cause damage. ...pests like aphids which infest cereal crops.

Definition of infest verb in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

in•fest (in fest′), v.t. to live in or overrun to an unwanted degree or in a troublesome manner, esp. as predatory animals or vermin do: Sharks infested the coastline. to be numerous in, as …

The verb infest means to invade in large number, often resisting control and causing damage or hardship. Bedbugs can infest people's belongings and even their bodies, or mice may infest …

INFEST meaning: to be in or over (a place, an animal, etc.) in large numbers often used as (be) infested