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Definition of mortise lock noun from the Oxford Advanced Learner's Dictionary

mortise lock

noun

/ˈmɔːtɪs lɒk/

/ˈmɔːrtɪs lɑːk/

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a lock that is fitted inside a hole cut into the edge of a door, not one that is fitted into the surface of one side

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See mortise lock in the Oxford Advanced American Dictionary

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