Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “pest”


noun [C]    /pest/
an insect or small animal that is harmful or damages crops : The aphid is a garden pest. infml A pest is also an annoying person , esp . a child : My brother is such a pest.
(Definition of pest noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on the pronunciation of pest

Browse related topics

You are looking at an entry to do with General & informal words for animals, but you might be interested in these topics from the Animals generally topic area:

Definitions of “pest” in other dictionaries

Word of the Day


the art and knowledge involved in preparing and eating good food

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More