Definitions

1. adjective

secretly working or operating in a hidden or disguised manner, especially in order to gather information or achieve a goal

“The detective went undercover to infiltrate the gang’s inner circle.”

2. noun

a person who works or operates in a hidden or disguised manner, especially in order to gather information or achieve a goal

“The undercover agent was able to get close to the suspect without being detected.”

3. verb

to secretly work or operate in a hidden or disguised manner, especially in order to gather information or achieve a goal

“The police undercover operation was able to catch the thief in the act.”