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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Oct 17, 2024 · Locks are the first line of defense for your home's security. Read our guide to learn about the most effective locks and how to install them.

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Dec 20, 2025 · lock (plural locks) Something used for fastening, which can only be opened with a key or combination. quotations

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a door, gate, lid, drawer, or the like in position when closed, consisting of a bolt or system of bolts propelled and withdrawn by a mechanism operated by a …