supergrass
/ (ˈsuːpəˌɡrɑːs) /
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noun
an informer whose information implicates a large number of people in terrorist activities or other major crimes
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On the farm, the feed for chicks is significantly different from the roosters’; ______ not even comparable.
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences from the Web for supergrass
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.