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Definition of undercover:

Synonyms for undercover:

hugger-mugger, stealth, sneaky, secretive, private, behind-the-scenes, classified, underground, shadowy, in strict confidence, show, secret, sneaking, confidential, privy, stealthy, covert, mysterious, cloak-and-dagger, sneak, under wraps, backstairs, huggermugger, clandestine, hush-hush, surreptitious, on the quiet, furtive, sub rosa, hole-and-corner, underhand, underhanded.

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