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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Apr 13, 2026 · lock (plural locks) Something used for fastening, which can only be opened with a key or combination. quotations

Lock definition: A device operated by a key, combination, or keycard and used, as on a door, for holding, closing, or securing.

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Replace or cut new keys for padlocks, enclosures, cabinet doors, and locksets.