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

1850–55; under- + cover

1. concealed, covert, clandestine, hidden.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
undercover (ˌʌndəˈkʌvə)
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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Word Origin & History

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
He was once filmed rejecting a bribe from an undercover agent, but appearing
  willing to discuss it later.
But an undercover federal agent had ordered some orchids from him, a few of
  which arrived without the correct papers.
Foreign journalists are followed around by undercover agents: their e-mails are
  monitored and their phones tapped.
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