under lock and key
Definition
› 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)
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Locking and bolting
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