Etymology
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undercover (adj.)

1854, "sheltered," from under + cover (n.). Sense of "operating secretly" attested from 1920.

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Definitions of undercover

undercover (adj.)
conducted with or marked by hidden aims or methods;
an undercover investigation
Synonyms: clandestine / cloak-and-dagger / hole-and-corner / hugger-mugger / hush-hush / secret / surreptitious / underground
From wordnet.princeton.edu