Did you know?

Click any word in a definition or example to find the entry for that word

infest - definition and synonyms


What are red words?

90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.



Thesaurus diagram

The thesaurus of synonyms and related words is fully integrated into the dictionary. Click on the thesaurus category heading under the button in an entry to see the synonyms and related words for that meaning.

verb [transitive]     infest pronunciation in American English
Word Forms
present tense
present participleinfesting
past tenseinfested
past participleinfested
  1. 1
    if animals or insects infest a place, there are very many of them in it, so that they might cause damage or disease
    be infested by/with something:

    The entire house was infested with mice.

    Synonyms and related words
    Synonyms and related words
  2. 2
    informal to make a place or situation very unpleasant by being present in large numbers or quantities

    The article went on at length about the “awful programs that infest our television screens.”

quiz invitation


a description of an economic or political situation based on analysis of information at the present time

BuzzWord Article

Open Dictionary


an unregulated form of capitalism that features financial deregulation, privatisation and low tax for high earners

add a word


A must for anyone with an interest in the changing face of language. The Macmillan Dictionary blog explores English as it is spoken around the world today.

global English and language change from our blog
Macmillan learn live love play