c.1300, "armed conflict, struggle with adversity or pain," from Anglo-Fr.
estur, from O.Fr.
estour, from P.Gmc.
*sturmoz "storm" (see
storm). Became obsolete, revived by Spenser and his followers in various senses; also surviving as a Scottish and Northern English word meaning "a (driving) storm" or "uproar, commotion."