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.

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 …

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.

A heavy-duty combination lock or a padlock can secure outdoor storage, fences, self-storage units or lockers, keeping your belongings safe. When purchasing a combination lock, choose one …

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

Definition of lock noun in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Lock definition: A device operated by a key, combination, or keycard and used, as on a door, for holding, closing, or securing.

Oct 13, 2023 · To Lock, in Fencing, is to seize your adversary's sword-arm, by twining your left arm round it, after closing your parade, shell to shell, in order to disarm him.

The lock on something such as a door or a drawer is the device which is used to keep it shut and prevent other people from opening it. Locks are opened with a key.