Word Origin & History
suddenlate 13c., perhaps via Anglo-Fr. sodein, from O.Fr. subdain "immediate, sudden," from V.L. *subitanus, variant of L. subitaneus "sudden," from subitus "come or go up stealthily," from sub "up to" + ire "come, go." Phrase all of a sudden first attested 1680s, earlier of a sudayn (1590s), upon the soden
(1550s). Sudden death, tie-breakers in sports, first recorded 1927; earlier in ref. to coin tosses (1834).