mortise lock
noun [ C ] (also mortice lock) uk/ˈmɔː.tɪs ˌlɒk/ us/ˈmɔːr.t̬ɪs ˌlɑːk/
（嵌入门里的）插锁，嵌锁
a lock that is inside the edge of a door, so that it cannot be seen or removed when the door is closed
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