grass up

English

Etymology

From grass (“informer”).[1]

Verb

(Britain, slang) To betray by informing on.
- 1999, Angela Devlin, Bob Turney, Going Straight: After Crime and Punishment →ISBN:
  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.

Synonyms

drop a dime, name names, snitch; See also Thesaurus:rat out

Related terms

supergrass

References

The New Partridge Dictionary of Slang →ISBN

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