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How to sign: 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 mobilizati;
Similiar / Same: cloak-and-dagger, hush-hush, on the quiet, undercover, hole-and-corner, hugger-mugger, secret, surreptitious, underground