whistle

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whistle

slang A suit. The term comes from the rhyming slang in which "whistle" is short for "whistle and flute," which rhymes with "suit." Primarily heard in UK. How could you forget your brand new whistle? What are you going to wear to the wedding now?
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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