under lock and key Meaning in the Cambridge English Dictionary
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Meaning of “under lock and key” in the English Dictionary

"under lock and key" in British English

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under lock and key

locked away ​safely: Her ​jewellery is ​securely under lock and ​key at the ​bank. If a ​person, ​especially a ​criminal, is under lock and ​key, they are being ​kept in a ​place from which they cannot ​escape, usually a ​prison.
(Definition of under lock and key from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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