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English definition of “lock sb up”

lock sb up

phrasal verb with lock     /lɒk/ US  /lɑːk/ verb
to put someone in a prison or a hospital for people who are mentally ill: Murderers should be locked up for life. After what she did, they should lock her up and throw away the key (= lock her up until she dies). → See also lock-upPutting people in prison
(Definition of lock sb up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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