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 undercover 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
Ashlyn Robinette, People.com, 18 June 2025
Another investigator used an undercover profile to contact Slusher as others worked to identify him, deputies said.
—Kate Linderman, Fort Worth Star-Telegram, 13 June 2025
Manuel Betancourt, Los Angeles Times, 11 June 2025
Want to see what else is up for grabs during Wayfair’s undercover Kelly Clarkson Home sale?
—Shea Simmons, People.com, 6 Feb. 2025
See All Example Sentences for undercover
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Adjective
Sarli did, however, recently post about the ordeal on TikTok, so her viral video and media attention might expose their undercover rendezvous to the bride and groom.
—Ashlyn Robinette, People.com, 18 June 2025
Another investigator used an undercover profile to contact Slusher as others worked to identify him, deputies said.
—Kate Linderman, Fort Worth Star-Telegram, 13 June 2025
Noun
Michael Fassbender stars as Martian, a CIA spy who’s recalled to London after years of living deep undercover in Ethiopia.
—Manuel Betancourt, Los Angeles Times, 11 June 2025
Want to see what else is up for grabs during Wayfair’s undercover Kelly Clarkson Home sale?
—Shea Simmons, People.com, 6 Feb. 2025
See All Example Sentences for undercover
Cite this Entry
“Undercover.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/undercover. Accessed 1 Jul. 2025.
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