lock [lɒk]

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vt. 锁；锁上；使固定；隐藏；vi. 卡住，不动；n. 锁；水闸；一撮

a device which prevents something such as a door being opened and which you can only open with a key

This box doesn't lock. 这只箱子锁不上。
Will you lock up the house, please? 请将房门锁起来，好吗？