Word Origin & History
jag"period of unrestrained activity," 1887, Amer.Eng. from sense "load of hay or wood" (1597), of unknown origin, used in U.S. colloquial speech from 1834 to mean "a quantity, a lot."
EXPANDjagged1440, from obs. verb jaggen (1373) "to notch or nick," Scot. and northern English, of unknown origin. Originally of garments with regular "toothed" edges; meaning "with the edge irregularly cut" is from 1577.
COLLAPSE