supergrass

English

Etymology

super- +‎ grass, from grass (“(slang) an informer”).

Noun

supergrass (plural supergrasses)

  1. An informer providing substantial quantities of information on criminal or terrorist activities to the police.
    • 2000, D. Walsh, Bloody Sunday and the Rule of Law in Northern Ireland, page 241:
      In several cases the supergrass spent days in the witness box giving evidence of scores of offences allegedly committed by many individuals over a period of years.
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