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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)
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