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a door, gate, lid, drawer, or the like in position when closed, consisting of a bolt or system of bolts propelled and withdrawn by a mechanism operated by a key, …

1. To become fastened by or as if by means of a lock: The door locks automatically when shut. 2. To become entangled or jammed; interlock. 3. To become rigid or immobile: The mechanism tends to …

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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