Definition of infest
- a slum infested with crime
- shark-infested waters
in desperation, we called in an exterminator because the house was infested with ants
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'infest.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use: 1602See Words from the same year
of something harmful or unwanted : to be in or over (a place, an animal, etc.) in large numbers
What made you want to look up infest? Please tell us where you read or heard it (including the quote, if possible).
Merriam-Webster's New Words Quiz—Fall 2017 Edition!
Can you spell these 10 commonly misspelled words?TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.TAKE THE QUIZ