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Why turkey has the same name as Turkey

rat on

Betray a comrade by giving information, as in He ratted on his best friend to the police. [ ; early 1900s ]
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Word Value for rat

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