grass on/up

phrasal verb
grassed on/up; grassing on/up; grasses on/up

Definition of grass on/up

British slang
: to tell the police about the criminal activity of (someone) He refused to grass on his friends. Someone grassed him up.

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Cite this Entry

“Grass on/up.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/grass%20on%2Fup. Accessed 25 Nov. 2020.

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