Definition of "grassing" [grassing]

• Present participle of grass. (verb)

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• "However, for understandable recent-historical reasons the idea of grassing up your neighbours to the authorities is pretty taboo here, so I didn't."
• "Give fanatics shorter jail terms for 'grassing' says Government's anti-terror law watchdog"
• "Stephen Parish, prosecuting, said the motive for the burglary was unclear but may have been out of revenge for the occupants apparently "grassing" to the police about a previous burglary."