[ uhn-der-kuhv-er, uhn-der-kuhv- ]
See synonyms for undercover on Thesaurus.com
  1. working or done out of public sight; secret: an undercover investigation.

  2. engaged in spying or securing confidential information: an undercover agent.

Origin of undercover

First recorded in 1850–55; under- + cover

Other words for undercover

Words Nearby undercover

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use undercover in a sentence

British Dictionary definitions for undercover


/ (ˌʌndəˈkʌvə) /

  1. done or acting in secret: undercover operations

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Idioms and Phrases with undercover


Protected by a shelter, as in It began to pour but fortunately we were under cover. [c. 1400]

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.