- working or done out of public sight; secret: an undercover investigation.
- engaged in spying or securing confidential information: an undercover agent.
Origin of undercover
SynonymsSee more synonyms for undercover on Thesaurus.com
1. concealed, covert, clandestine, hidden.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for undercover
A 19-year-old woman was killed in September after an undercover police watched a drug deal go down in Oklahoma City.The 14 Teens Killed by Cops Since Michael Brown
November 25, 2014
“We have undercover security,” says Vincent Zurzolo, the suave man in the blue suit in booth 2630 of New York Comic Con.
If you were to have undercover security, Comic Con is the perfect site.
Others seemed to be performing bombastic recitals of their grievances as if they were ill-trained actors or undercover agents.Hong Kong Between Calm and Chaos
October 3, 2014
Undercover detective Gustav Frank sold Mandelbaum several bolts of stolen silk that had been secretly marked.Meet 'The Queen of Thieves' Marm Mandelbaum, New York City's First Mob Boss
J. North Conway
September 7, 2014
Lots of things that went on undercover come out in the open.Thy Rocks and Rills
Robert Ernest Gilbert
Of course there were undercover agents on Zarathustra, hundreds of them.Little Fuzzy
Henry Beam Piper
Well, it's a combination of vice, narcotics, and undercover work.Warren Commission (7 of 26): Hearings Vol. VII (of 15)
The President's Commission on the Assassination of President Kennedy
The Foundation has to maintain its undercover status if it is going to accomplish anything.Planet of the Damned
At the same time rapid movement made considerable noise in the undercover.The Avifauna of Micronesia, Volume 3
Rollin H. Baker
- done or acting in secretundercover operations
Word Origin and History for undercover
Online Etymology Dictionary, © 2010 Douglas Harper