supergrass

/ ˈsuːpəˌɡrɑːs /

noun

an informer whose information implicates a large number of people in terrorist activities or other major crimes

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Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The supergrass replied: "No I gave his name because he was responsible for the shootings on North Queen Street."

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The supergrass also told Belfast Crown court that he foiled a plan to kill 19 Catholic men in a work minibus in June 1994.

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A planned trial collapsed in 2011, after a judge ruled so-called supergrass evidence could not be used in the case.

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Police work with three supergrass witnesses - criminals who are giving information.

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Terence Stamp is the supergrass ex-criminal exiled in Spain who finds that old comrades have caught up with him, intent on settling scores.