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 operated by a key, combination, or keycard and used, as on a door, for holding, closing, or securing.