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We found 5 dictionaries that define the word grass up:

General (5 matching dictionaries)
  1. grass up: Merriam-Webster
  2. grass up: Collins English Dictionary
  3. grass up: Wiktionary
  4. grass up: TheFreeDictionary.com

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Definitions from Wiktionary (grass up)

▸ verb:  (UK, slang) To betray by informing on.

Similar:
grass on, grass, dob in, blow, blow the gaff, bubble, burn, snitch up, roll, roll on, more...

Opposite:
cover up, protect, defend, conceal

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Similar:
grass on, grass, dob in, blow, blow the gaff, bubble, burn, snitch up, roll, roll on, more...

Opposite:
cover up, protect, defend, conceal



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