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undercover

un·der·cov·er

undercover

pronunciation:
uhn dr kuh vr
features:
Word Parts
part of speech: adjective
definition 1: carried out or happening in secret.
He was engaged in undercover police work at that time.
synonyms:
clandestine, covert, secret, surreptitious
antonyms:
overt
similar words:
confidential, furtive, hidden, hush-hush, sly, stealthy, underground
definition 2: engaged in secret or confidential activities, as a spy.
She'd been an undercover agent during the Cold War.
similar words:
secret