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English definition of “lock”

lock

noun [C]     /lɒk/
IN DOOR B1 the thing that is used to close a door , window , etc , and that needs a key to open it: I heard someone turn a key in the lock. safety locks Locking and bolting
WATER a place on a river with gates to allow boats to move to a different water level Parts of watercourses
(Definition of lock noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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