Definition of bolt noun from the Oxford Advanced Learner's Dictionary

     

    bolt

     noun
    noun
    BrE BrE//bəʊlt//
     
    ; NAmE NAmE//boʊlt//
     
    Sky, How machines work
     
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  1. 1a long, narrow piece of metal that you slide across the inside of a door or window in order to lock it He slid back the bolt on the door.
  2. 2a piece of metal like a screw without a point which is used with a circle of metal (= a nut) to fasten things together nuts and bolts See related entries: How machines work
  3. 3bolt of lightning a sudden flash of lightning in the sky, appearing as a line See related entries: Sky
  4. 4a short heavy arrow shot from a crossbow
  5. 5a long piece of cloth wound in a roll around a piece of cardboard
  6. Word Originnoun senses 1 to 4 Old English, ‘arrow’, of unknown origin; related to Dutch bout and German Bolzen ‘arrow, bolt for a door’. noun sense 5 Middle English: transferred use of bolt ‘metal pin’.Idioms an event or a piece of news which is sudden and unexpected; a complete surprise Her dismissal came as a bolt from the blue. See related entries: Surprise (informal) to have used all your power, money or supplies
    make a bolt for something, make a bolt for it
     
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    to run away very fast, in order to escape The pony suddenly made a bolt for freedom.
    the nuts and bolts (of something)
     
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    (informal) the basic practical details of a subject or an activity
See the Oxford Advanced American Dictionary entry: bolt