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.

Find the best smart lock for your home, ensure your doors are locked by checking an app, and stop worrying about it. You can also use a code or fingerprint for entry or remotely let in friends …

In more complex mechanical lock/key systems, two different keys, one of which is known as the master key, serve to open the lock. Common metals include brass, plated brass, nickel silver, …

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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.