undercover

About 0.82 uses per million words.

Meaning

1. adjective Performed or happening in secret.
2. adjective Employed or engaged in spying or secret investigation.
3. noun A person who works undercover.
4. verb To provide too little coverage.

Similar words

cloak-and-dagger hole-and-corner clandestine covert surreptitious on the quiet secret hush-hush hugger-mugger underground

Often followed by

agent agents work police operations operation cop officer officers

Word family

undercover agent undercover agents undercovers