un·der·cov·er

[uhn-der-kuhv-er, uhn-der-kuhv-]
adjective
1.
working or done out of public sight; secret: an undercover investigation.
2.
engaged in spying or securing confidential information: an undercover agent.

Origin:
1850–55; under- + cover


1. concealed, covert, clandestine, hidden.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
undercover (ˌʌndəˈkʌvə) [Click for IPA pronunciation guide]
 
adj
done or acting in secret: undercover operations

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
Undercover is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a stew of meat, vegetables, potatoes, etc.
Etymonline
Word Origin & History

undercover
1854, sheltered," from under + cover. Sense of "operating secretly" attested from 1920.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But if you were a secret agent working undercover, you would be extra careful
  too.
Undercover agents arrest a suspected rooster fighter while in possession of
  contraband birds.
Foreign journalists are followed around by undercover agents: their e-mails are
  monitored and their phones tapped.
Undercover officers pose as construction workers to gather evidence of rooster
  fighting.
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