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English definition of “lock sb in”

lock sb in

verb uk phrasal verb with lock   /lɒk/ us    /lɑːk/
B2 to prevent someone from leaving a room or building by locking the door: She stormed off to her bedroom and locked herself in. He was locked in his bedroom as a punishment.Locking and bolting to prevent someone from ending or changing a financial arrangement: Most phone contracts lock you in for a fixed period.
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(Definition of lock sb in from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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