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swear to secrecy

idiom

: to promise to keep a secret

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swear (someone) to silence
swear to secrecy
swear up and down
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“Swear to secrecy.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/swear%20to%20secrecy. Accessed 5 Dec. 2025.

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