To keep dark. To lie perdu; to lurk in concealment. (Ang. Sax.
“We'd get away to some of the far-out stations ... where we could
keep in the dark.” —Boldrewood: Robbery Under Arms, xvi.
Keep it in the dark.
Keep it a dead secret; don't enlighten anyone about the matter.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
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