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English definition of “bolt”

bolt

noun [C] (LOCK)    /bəʊlt/ US  /boʊlt/
a metal bar on a door or window that slides across to lock it closed: I closed the window and drew the bolt (= slid the bolt across).Locks and locksmithing
(Definition of bolt noun (LOCK) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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