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
Synonyms
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
Will Carless, USA TODAY, 14 Dec. 2024
There were no undercover FBI agents on the National Mall on Jan. 6, 2021, as then-President Trump encouraged his supporters to march to the Capitol, according to the Department of Justice’s (DOJ) Office of the Inspector General, rebutting a conspiracy theory surrounding the day’s events.
—Rebecca Beitsch, The Hill, 12 Dec. 2024
Justin Kroll, Deadline, 11 July 2024
Blazer had been wearing a wire, working in tandem with an FBI undercover, ensnaring more than ten coaches in an elaborate plot that revealed corruption in the basketball programs at Louisville, Arizona, LSU, USC and other schools.
—Guy Lawson, Rolling Stone, 24 Mar. 2024
See all Example Sentences for undercover 
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Adjective
The canard that the Jan. 6 riot was actually an FBI setup and was driven on by undercover agents has been circulating since the days after the attack.
—Will Carless, USA TODAY, 14 Dec. 2024
There were no undercover FBI agents on the National Mall on Jan. 6, 2021, as then-President Trump encouraged his supporters to march to the Capitol, according to the Department of Justice’s (DOJ) Office of the Inspector General, rebutting a conspiracy theory surrounding the day’s events.
—Rebecca Beitsch, The Hill, 12 Dec. 2024
Noun
Starring Sean Penn, it was based on a book Crowe wrote after spending a year undercover as a student at Clairemont High School in San Diego.
—Justin Kroll, Deadline, 11 July 2024
Blazer had been wearing a wire, working in tandem with an FBI undercover, ensnaring more than ten coaches in an elaborate plot that revealed corruption in the basketball programs at Louisville, Arizona, LSU, USC and other schools.
—Guy Lawson, Rolling Stone, 24 Mar. 2024
See all Example Sentences for undercover
Dictionary Entries Near undercover
Cite this Entry
“Undercover.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/undercover. Accessed 26 Dec. 2024.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share