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monkey suit

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noun Slang.
  1. a tuxedo or full-dress suit.
  2. any uniform.
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Origin of monkey suit

First recorded in 1885–90; see origin at monkey jacket
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for monkey suit

monkey suit

noun
  1. US slang a man's evening dress
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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