Definition of flash over in English:

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flash over

1Make an electric circuit by sparking across a gap.
Example sentences
  • The theory here is that the primer flashes over the small powder charge and causes it to detonate.
  • An arc then flashes over between these electrodes 24 and 13, giving rise to ionization and pressurization.
  • If the voltage is high enough, the insulator flashes over causing a short circuit of the system.
1.1(Of a fire) spread instantly across a gap because of intense heat.
Example sentences
  • 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.
See parent entry: flash
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