infest

verb

in·​fest in-ˈfest How to pronounce infest (audio)
infested; infesting; infests

transitive verb

1
: to spread or swarm in or over in a troublesome manner
a slum infested with crime
shark-infested waters
2
: to live in or on as a parasite
infestant noun
infestation noun
infester noun

Examples of infest in a Sentence

in desperation, we called in an exterminator because the house was infested with ants
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Complacent people can infest the minds of those around them. Dalton Ross, EW.com, 30 Oct. 2024 The holdup caused a public outcry because the rule changes are intended to help the Agriculture Department stem the movement of commodities infested by pests, including coconut rhinoceros beetles. CBS News, 24 Oct. 2024 Their home was infested with termites—millions of them, silently eating through the wooden beams, floors, and walls. Amplified Content Studio, The Mercury News, 22 Oct. 2024 The house was infested with termites and needed major structural upgrades. Ernestine Siu, CNBC, 15 Oct. 2024 See all Example Sentences for infest 

Word History

Etymology

French infester, from Latin infestare, from infestus hostile

First Known Use

1602, in the meaning defined at sense 1

Time Traveler
The first known use of infest was in 1602

Dictionary Entries Near infest

Cite this Entry

“Infest.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/infest. Accessed 22 Nov. 2024.

Kids Definition

infest

verb
in·​fest in-ˈfest How to pronounce infest (audio)
1
: to spread or swarm in or over in a troublesome manner
a neighborhood infested with crime
shark-infested waters
2
: to live in or on as a parasite
horses infested with worms
infestation noun

Medical Definition

infest

transitive verb
in·​fest in-ˈfest How to pronounce infest (audio)
: to live in or on as a parasite
the flea that infests cats
horses infested with worms
compare infect

More from Merriam-Webster on infest

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!