skedaddle

First use appears c. 1861, in the New York Tribune. The word appeared and gained 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”), of North Germanic/Scandinavian origin, from Old Norse *skǫðull; akin to Old Norse skaði (“harm”). Possibly related to the Ancient Greek σκέδασις (skédasis, “scattering”), σκεδασμός (skedasmós, “dispersion”). Possibly related to scud or scat.