Skedaddle
wiktionary
19th century US - dramatically appearing and gaining prominence in Civil War military contexts around 1861, and rapidly passing into more general use. Possibly an alteration of British dialect scaddle(“to run off in a fright”), from the adjective scaddle(“wild, timid, skittish”), from Middle English scathel, skadylle(“harmful, fierce, wild”), perhaps of North Germanic/Scandinavian origin, from Old Norse *sköþull; or from Old English *scaþol, *sceaþol (see scathel); akin to Old Norse skaði(“harm”).
Possibly related to the Ancient Greek σκέδασις(skédasis, “scattering”), σκεδασμός(skedasmós, “dispersion”). Possibly related to scud or scat.
etymonline
skedaddle (v.)
"to run away," 1861, American Civil War military slang, of unknown origin, perhaps connected to earlier use in northern England dialect with a meaning "to spill." Liberman says it "has no connection with any word of Greek, Irish, or Swedish, and it is not a blend" [contra De Vere]. He calls it instead an "enlargement of dial. scaddle 'scare, frighten.'" Related: Skedaddled; skedaddling. As a noun from 1870.
