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 (something) in or lock in (something) : to do something that makes you sure to get (something that could change, such as a good price, an interest rate, etc.)

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

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