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English definition of “lock sb up”

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lock sb up

verb uk phrasal verb with lock   /lɒk/ us    /lɑːk/
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).
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(Definition of lock sb up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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