undercover

[uhn-der-kuhv-er, uhn-der-kuhv-] Origin

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. 2012.
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Undercover is always a great word to know.
So is zedonk. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
the offspring of a zebra and a donkey.
Collins
World English Dictionary
undercover (ˌʌndəˈkʌvə)
 
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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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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