Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “grass”

grass

noun [C] (PERSON)    /ɡrɑːs/ US  /ɡræs/ UK slang
a person, usually a criminal, who tells the police about other criminals' activities → See also supergrassPeople who reveal secrets and tell talesMiscellaneous criminals
(Definition of grass noun (PERSON) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of grass

Definitions of “grass” in other dictionaries

Word of the Day

altruistic

showing a wish to help or bring advantages to others, even if it results in disadvantage for yourself

Word of the Day

Blog

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