plain clothes

noun
clothing other than one's uniform, especially civilian clothes worn on duty by a police officer.
Also, plain·clothes.


Origin:
1815–25

plain-clothes, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
plain clothes
 
pl n
a.  ordinary clothes, as distinguished from uniform, as worn by a police detective on duty
 b.  (as modifier): a plain-clothes policeman

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
plain clothes is always a great word to know.
So is zedonk. Does it mean:
a gadget; dingus; thingumbob.
the offspring of a zebra and a donkey.
Etymonline
Word Origin & History

plain clothes
"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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Example sentences
The team wears plain clothes and uses an unmarked car.
Dere was a whole army of plain clothes bulls around.
Two officers were sent out each night to patrol the streets in plain clothes.
These directed patrols will include plain clothes officers on foot in and
  around areas of student housing.
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