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English definition of “lock-in”

lock-in

noun [C] (PUB)    /ˈlɒk.ɪn/ US  /ˈlɑːk-/
UK informal an occasion when a pub locks its doors and allows people to continue drinking illegally after the time when it should have closed: There was a lock-in at my local last night.Selling and serving alcoholic drinks
(Definition of lock-in noun (PUB) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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