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supergrass

British  
/ ˈsuːpəˌɡrɑːs /

noun

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

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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Meanwhile, questions continue to be asked over whether the right men were jailed for the killings, and what happened to the so-called supergrass who turned on them.

From BBC Dec. 6, 2025

The lilies and chrysanthemums were far more delicate than the government-enforced supergrass, but at least they were of her choosing.

From Slate Feb. 21, 2018

That colleague, who will be central to any new investigation, is Neil Putnam, a self-confessed corrupt detective turned supergrass.

From The Guardian Jun. 3, 2014

The new supergrass law involves a signed contract with the CPS to give evidence against criminal associates on the understanding that they might have their own jail terms discounted.

From BBC Oct. 8, 2012

Evidence from just one supergrass, Christopher Black, has led to 35 convictions, including that of Kevin Artt.

From Time Magazine Archive

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