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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LOCK definition: 1. a device that prevents something such as a door from being opened and can only be opened with a…. Learn more.

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Dec 9, 2025 · After 40 hours of research and interviews with locksmiths and security experts, the Schlage B60N deadbolt is the best door lock for most homes.

Define lock. lock synonyms, lock pronunciation, lock translation, English dictionary definition of lock. n. 1. A device operated by a key, combination, or keycard and used, as on a door, for holding, closing, or …

Sep 26, 2023 · A deadbolt lock is the most common option for home security, consisting of a thick metal bolt that protrudes through a strike plate and into the door frame to prevent the door from being opened.