grass on/up

phrasal verb

grassed on/up; grassing on/up; grasses 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.

Dictionary Entries Near grass on/up

Cite this Entry

“Grass on/up.” Dictionary, Merriam-Webster, Accessed 22 Mar. 2023.

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