1

undercover

play
adjective un·der·cov·er \ˌən-dər-ˈkə-vər\

Definition of undercover

  1. :  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

  1. an undercover operation to infiltrate the terrorist organization

  2. for months she's been an undercover agent pretending to be a drug dealer

Recent Examples of undercover from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'undercover'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of undercover

1920


2

undercover

noun un·der·cov·er

Definition of undercover

  1. :  a person engaged in undercover activity :  spy

Examples of undercover in a Sentence

  1. 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 of undercover from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'undercover'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of undercover

1962


UNDERCOVER Defined for English Language Learners

undercover

play
adjective

Definition of undercover for English Language Learners

  • : done or working in a secret way in order to catch criminals or collect information



Seen and Heard

What made you want to look up undercover? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

to bring about or cause (something)

Get Word of the Day daily email!

Test Your Vocabulary

The Emoji Quiz

  • emoji-the-quiz
  • What phase of the moon is this: 🌖 ?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!