Keep something or someone a secret or hidden.
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To keep something secret and not let anyone know about it.
When you keep something under wraps, you deliberately hide it from others until the right moment.
It's used when information is being kept confidential 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