grass up

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English[edit]

Etymology[edit]

Verb[edit]

grass up

  1. (UK, slang) To betray by informing on.
    • 1999, Angela Devlin, Bob Turney, Going Straight: After Crime and Punishment (ISBN 187287066X)
      My sister grassed me up to the caretaker! She thought she was doing me a favour — by grassing me up she was sure he'd let me off.
    • 1932, Arthur R. L. Gardner, Tinker's Kitchen[1]

Derived terms[edit]

References[edit]

  1. 1.0 1.1 1.2 1.3 Grass up from phrases.org.uk