Definition of flash over in English:

flash over

phrasal verb

  • 1Make an electric circuit by sparking across a gap.

    • ‘The theory here is that the primer flashes over the small powder charge and causes it to detonate.’
    • ‘If the voltage is high enough, the insulator flashes over causing a short circuit of the system.’
    • ‘An arc then flashes over between these electrodes 24 and 13, giving rise to ionization and pressurization.’
    1. 1.1(of a fire) spread instantly across a gap because of intense heat.
      • ‘Once the fire flashed over the side station, it quickly enveloped the deli restaurant, feeding on the combustible interior finishes and furnishings.’
      • ‘At about 4 p.m., the fire ‘flashed over’ and the buildings erupted in a mass of flame, trapping some staff on upper floors.’
      • ‘When the driver lifted the engine cover he provided the oxygen that was lacking and the fire ‘flashed over’ and spread quickly through the bus.’