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English definition of “under lock and key”

under lock and key

locked away safely : Her jewellery is securely under lock and key at the bank .Locking and bolting 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 .Putting people in prison
(Definition of under lock and key from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

Definitions of “under lock and key” in other dictionaries

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