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
Matt Grobar, Deadline, 24 Sep. 2025
Jessica Chastain expressed her disappointment with Apple’s decision to postpone the release of her upcoming limited series The Savant — about an undercover investigator who goes after online extremist groups — in the wake of Charlie Kirk’s assassination.
—Jon Blistein, Rolling Stone, 24 Sep. 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 undercover
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Adjective
Then, on October 16 — a week ahead of the Vikings’ showdown with the Los Angeles Rams on Thursday Night Football — star wide receiver Jefferson goes undercover as a nature photographer to get the inside scoop on the fast-growing sport of flag football.
—Matt Grobar, Deadline, 24 Sep. 2025
Jessica Chastain expressed her disappointment with Apple’s decision to postpone the release of her upcoming limited series The Savant — about an undercover investigator who goes after online extremist groups — in the wake of Charlie Kirk’s assassination.
—Jon Blistein, Rolling Stone, 24 Sep. 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 undercover
Cite this Entry
“Undercover.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/undercover. Accessed 30 Sep. 2025.
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