under cover
1 of 3phrase
1
: in an envelope or wrapper
2
: under concealment : in secret
un·der·cov·er
ˌən-dər-ˈkə-vər 
: acting or executed in secret
specifically
: employed or engaged in spying or secret investigation
an undercover agent
undercover
adverb
Examples of under cover in a Sentence
Adjective
an undercover operation to infiltrate the terrorist organization
for months she's been an undercover agent pretending to be a drug dealer
Noun
within the city was a well-organized fifth column, and these undercovers would make themselves known as soon as the invading forces breached the city limits
Recent Examples on the Web
Matthew Ablon, CBS News, 1 June 2026
The Washington Nationals are in full damage control after an undercover journalist with the O’Keefe Media Group caught now former Director of Community Relations Sean Hudson claiming to be religiously discriminating against Catholic starting pitcher Trevor Williams.
—Jon Root Outkick, FOXNews.com, 30 May 2026
Lynsey Eidell, PEOPLE, 30 May 2026
The Agency‘s second season will continue following Martian, a CIA agent living undercover in his own life.
—Rosy Cordero, Deadline, 19 May 2026
See All Example Sentences for under cover
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Adjective
Comeaux also said undercover officers would focus on drug enforcement.
—Matthew Ablon, CBS News, 1 June 2026
The Washington Nationals are in full damage control after an undercover journalist with the O’Keefe Media Group caught now former Director of Community Relations Sean Hudson claiming to be religiously discriminating against Catholic starting pitcher Trevor Williams.
—Jon Root Outkick, FOXNews.com, 30 May 2026
Noun
First, in February 2008, a Dutch TV station aired a confession allegedly made by van der Sloot and captured on a hidden camera by Patrick van der Eem, a businessman working undercover for a Dutch journalist.
—Lynsey Eidell, PEOPLE, 30 May 2026
The Agency‘s second season will continue following Martian, a CIA agent living undercover in his own life.
—Rosy Cordero, Deadline, 19 May 2026
See All Example Sentences for under cover
Cite this Entry
“Under cover.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/under%20cover. Accessed 2 Jun. 2026.
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