supergrass
- an informer whose information implicates a large number of people in terrorist activities or other major crimes
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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
Examples from the Web for supergrass
Contemporary Examples
The new names were handed over by a suspect turned "supergrass".
All this is small beer compared with the supergrass that BCL Burton Copeland may turn out to be.