Define bolt. bolt synonyms, bolt pronunciation, bolt translation, English dictionary definition of bolt. n. 1. A bar made of wood or metal that slides into a socket and is used to fasten doors and gates. First Known Use of bolt. Noun (1) before the 12th century, in the meaning defined at sense 1a. Verb (1) 13th century, in the meaning defined at intransitive sense 1. Adverb. 15th century, in the meaning defined at sense 1. Noun (2) 1577, in the meaning defined above. Verb (2) 13th century, in the meaning defined at sense 1 from bolt (n.) in its various senses; from a crossbow arrow's herees the meaning to spring, to make a quick start (early 13c.). Via the notion of runaway horses, …

bolt definition: 1. a metal bar on a door or window that slides across to lock it closed: 2. a screw-like metal object without a point, used with a nut to fasten things together 3. a flash of lightning that looks like a white line against the sky: . Learn more. To bolt is to run as quickly as you can. Racehorses are often described as bolting out of the gate. Other uses of bolt include the lock in your door, the act of locking that lock, and what a dog does when it gulps down his food. Thesaurus. Primary Meanings of bolt. 1. n v: from bolt (n.) in its various senses; from a crossbow arrow's herees the meaning to spring, to make a quick start (early 13c.). Via the notion of runaway horses, …