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English definition of “grass on sb”

grass on sb

UK slang phrasal verb with grass     /ɡrɑːs/ US  /ɡræs/ verb
If a person grasses on someone else, they tell the police or someone in authority about something bad that that person has done: Dan grassed on them to the local police.Revealing secrets and becoming known
(Definition of grass on sb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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