grass (on)

British slang
as in to talk
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

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“Grass (on).” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/grass%20%28on%29. Accessed 8 Feb. 2023.

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