under lock and key

idiom

Definition of under lock and key

: in a room, box, etc., that is locked The jewels are kept under lock and key. The prisoner is being kept/held under lock and key.

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“Under lock and key.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/under%20lock%20and%20key. Accessed 28 Oct. 2020.

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