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undercover

[uhn-der-kuhv-er, uhn-der-kuhv-] /ˌʌn dərˈkʌv ər, ˈʌn dərˌkʌv-/
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 of undercover
1850-1855
First recorded in 1850-55; under- + cover
Synonyms
1. concealed, covert, clandestine, hidden.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for undercover

undercover

/ˌʌndəˈkʌvə/
adjective
1.
done or acting in secret: undercover operations
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 undercover
adj.

1854, "sheltered," from under + cover (n.). Sense of "operating secretly" attested from 1920.

Online Etymology Dictionary, © 2010 Douglas Harper
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