
Keep something dark
Privacy Matters
Used when information is sensitive and revealing it could have personal or professional consequences.

It's best to keep your medical history dark at work.
Connotation of Mystery
Implies something mysterious or intriguing, can make others curious about the hidden information.

She kept her past dark, which made everyone more interested.
Trust Essential
Used in contexts where trust between the person keeping it dark and the confidant is vital.

I knew I could keep the secret dark with him; he never gossips.
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