leave (someone) in the dark (about something)

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leave (someone) in the dark (about something)

To keep someone uninformed (about something); to exclude someone from full knowledge or disclosure (of something). The CIA left the president in the dark about the assassination attempt so that if things went sour and came to public light, she could claim plausible deniability. I don't fully trust John to keep our plan a secret, so I think it best that we leave him in the dark for now.
See also: dark, leave
References in classic literature ?
These were sitting, only yesterday evening, musing over a fragment of candle which must soon go out and leave them in the dark for the rest of their nights, when surely some Angel whispered the name of Nicodemus Boffin, Esquire, to their souls, imparting rays of hope, nay confidence, to which they had long been strangers