The meaning of LOCK is a fastening (as for a door) operated by a key or a combination. How to use lock in a sentence.

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The lock on something such as a door or a drawer is the device which is used to keep it shut and prevent other people from opening it. Locks are opened with a key.

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LOCK definition: a device for securing a door, gate, lid, drawer, or the like in position when closed, consisting of a bolt or system of bolts propelled and withdrawn by a mechanism operated by a key, …