grass on

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verb, British slang

Definition of GRASS

to give information (as to the authorities) about another's improper or unlawful activities <that bloke would grass on his own mater to save himself>

Synonyms fink, grass (on) [British slang], inform, rat (on), sing, snitch, split (on) [British], squeak, talk, tell (on)

Related Words betray, give away, turn in; backstab, cross, double-cross, sell (out), two-time; blab, tattle; tip (off)