undercover
Americanadjective
-
working or done out of public sight; secret.
an undercover investigation.
- Synonyms:
- hidden, clandestine, covert
-
engaged in spying or securing confidential information.
an undercover agent.
adjective
Etymology
Origin of undercover
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Her plot-rich story includes art terrorists, undercover agents, snooty Parisians, sneaky New Yorkers and a one-armed billionaire.
From The Wall Street Journal • Mar. 30, 2026
The stranger, however, arrived at the rendezvous accompanied by undercover police officers, who arrested the man.
From The Wall Street Journal • Mar. 22, 2026
And to make it even more zany — what if someone went undercover in that animal body?
From Los Angeles Times • Mar. 4, 2026
The first three seasons of "Tehran", which focused on a Mossad agent working undercover in the Iranian capital, were filmed in Athens.
From Barron's • Feb. 16, 2026
Besides, she doesn’t trust anyone since she learned of the undercover training at the Domestic Academy.
From "Before We Were Free" by Julia Alvarez
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
