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
Griff Griffin, MSNBC Newsweek, 6 Dec. 2025
According to court documents, an undercover officer spotted a transaction in the mall parking lot from about 10 feet away.
—Abby Dodge, CBS News, 6 Dec. 2025
Martin Suarez, Rolling Stone, 13 Sep. 2025
Season 2 of the hit Paramount+ series will continue following Martian (Michael Fassbender), a CIA agent living undercover in his own life.
—Max Goldbart, Deadline, 4 Sep. 2025
See All Example Sentences for under cover
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Adjective
The following list of darkly gripping movies include undercover police operations, addictive assassin dramas, and perilous hijacking odysseys based on true stories.
—Griff Griffin, MSNBC Newsweek, 6 Dec. 2025
According to court documents, an undercover officer spotted a transaction in the mall parking lot from about 10 feet away.
—Abby Dodge, CBS News, 6 Dec. 2025
Noun
Four other agents accompanied me, all also operating undercover.
—Martin Suarez, Rolling Stone, 13 Sep. 2025
Season 2 of the hit Paramount+ series will continue following Martian (Michael Fassbender), a CIA agent living undercover in his own life.
—Max Goldbart, Deadline, 4 Sep. 2025
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 13 Dec. 2025.
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