A sudden—and possibly damaging—increase in line voltage. See also surge protector, voltage regulator. Compare power failure, spike.

ETYM Latin surgere, surrectum, to raise, to rise; sub under + regere to direct: cf. Old Fren. surgeon, sourgeon, fountain. Related to Regent, Insurrection, Sortie, Source.
(Homonym: serge).
A sudden or abrupt strong increase; SYN. upsurge.

(Homonym: serge).
Abnormally high tide; see storm surge.