General English

General Science

  • noun a sudden increase in the flow of something such as water or electrical power


  • verb to move with force like a wave

Cars & Driving

  • noun unevenness in the power output of an engine caused by: (i) irregular fuel supply due to the clogging of a filter or a main jet, or to too lean an air/fuel mixture; (ii) an ignition fault due to misfiring


  • noun a sudden increase in electrical power in a system, due to a fault, noise or component failure


  • A transient voltage effect that causes a sudden, undesirable rise or fall in current.


  • A sudden and momentary increase in current or voltage. May be caused, for instance, by lightning, or faults in circuits. If protective measures are not employed, it may cause a failure, or significant damage. Also called electrical surge.
  • A sudden and momentary increase in a magnitude such as power or current.

Origin & History of “surge”

Latin surgere meant literally ‘lead up from below’, hence ‘rise’ – it originated as a compound verb formed from the prefix sub- ‘up from below’ and regere ‘rule’, hence ‘lead’ (source of English regiment, region, etc). English acquired it via Old Spanish surgir and Old French sourgir, by which time it had taken on watery associations, of waves heaving. Surgere also produced English resource (17th c.), resurrection (13th c.), and source.