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.

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a door, gate, lid, drawer, or the like in position when closed, consisting of a bolt or system of bolts propelled and withdrawn by a mechanism operated by a …

Solve many security issues with the right lock. A heavy-duty combination lock or a padlock can secure outdoor storage, fences, self-storage units or lockers, keeping your belongings safe.

Master Lock is recognized around the world as the authentic, enduring name in locks, combination padlocks and security products. Learn more about our extensive assortment of …

This product can be controlled with your voice through Alexa-enabled devices such as Amazon Echo and Amazon Tap. This product has sustainability features recognized by trusted …

Simply walk up to your door, and your door unlocks, all without you lifting your hand. Dual infrared sensors ensure it works in any lighting conditions, even at night. It is our job to make sure you …

Lock, mechanical device for securing a door or receptacle so that it cannot be opened except by a key or by a series of manipulations that can be carried out only by a person knowing the secret …

Nov 10, 2025 · We evaluate the most popular models, installing and testing them in our homes to help you decide which one to buy. With an outstanding 4.5-star rating and an Editors' Choice …