UNDERCOVER
\ˌʌndəkˈʌvə], \ˌʌndəkˈʌvə], \ˌʌ_n_d_ə_k_ˈʌ_v_ə]\
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conducted with or marked by hidden aims or methods; "clandestine intelligence operations"; "cloak-and-dagger activities behind enemy lines"; "hole-and-corner intrigue"; "secret missions"; "a secret agent"; "secret sales of arms"; "surreptitious mobilization of troops"; "an undercover investigation"; "underground resistance"
By Princeton University