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What do a.m. and p.m. stand for?

plain clothes

plural noun
1.
clothing other than one's uniform, especially civilian clothes worn on duty by a police officer.
Origin of plain clothes
1815-1825
1815-25
Related forms
plain-clothes, plainclothes, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for plain clothes

plain clothes

plural noun
1.
  1. ordinary clothes, as distinguished from uniform, as worn by a police detective on duty
  2. (as modifier): a plain-clothes policeman
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
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Word Origin and History for plain clothes
n.

"ordinary dress" (as opposed to military uniform), 1822; of police detectives, it is attested from 1842. Also plainclothes.

Online Etymology Dictionary, © 2010 Douglas Harper
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Word Value for plain

7
10
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