1. Electricity. a disruptive discharge around or over the surface of a solid or liquid insulator.
  2. the moment of conflagration or complete incineration caused by superheated air or combustibles.

verb (used without object)

  1. Electricity. to have or experience a flashover.


  1. an electric discharge over or around the surface of an insulator
  2. the sudden and rapid spread of fire through the air, caused by the ignition of smoke or fumes from surrounding objects
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