Definition of infest in English:


Syllabification: in·fest
Pronunciation: /inˈfest


[with object] (usually be infested)
(Of insects or animals) be present (in a place or site) in large numbers, typically so as to cause damage or disease: the house is infested with cockroaches [as adjective, in combination]: (-infested) shark-infested waters
More example sentences
  • Fleas infest the animal (rats, but other rodents as well), and these fleas move freely over to human hosts.
  • His McGill ghetto apartment is infested with mice and, try as he might, he can't seem to get rid of them.
  • The species was believed to have been wiped out in 1918 when rats infested their home island.
overrun, spread through, invade, infiltrate, pervade, permeate, inundate, overwhelm;
beset, plague, swarm
overrun, swarming, teeming, crawling, alive, ridden, lousy;
plagued, beset


late Middle English (in the sense 'torment, harass'): from French infester or Latin infestare 'assail', from infestus 'hostile'. The current sense dates from the mid 16th century.



Pronunciation: /ˌinfeˈstāSHən/
More example sentences
  • Campaigners warn that Britain's streets could be plagued by vermin infestations if people continue to dump their rubbish irresponsibly.
  • Movies about the end of the world or uncontrollable plagues and infestations are huge box office successes.
  • Indeed, worm infestations, lice and a variety of other health problems plague the residents of the water villages.

Definition of infest in: