Keep something or someone a secret or hidden.
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To keep something secret and let no one know.
When you keep something under wraps, you hide it on purpose until the right moment.
It's used when news is being held back before an official announcement.
"Off the Record"
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Sharing information informally with the understanding it won't be published
"Keep It to Yourself"
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To not tell anyone else something you know — a direct personal instruction
"Keep it Under Wraps"
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Deliberately keeping something secret until you're ready to reveal it