THESAURUS
jump the gun
anticipate, be predisposed, burn to, chafe, foreglimpse, forejudge, forerun, foresee, forestall, foretaste, fret, fuss, get ahead of, get excited, go before, go off half-cocked, hardly wait, hasten, itch to, judge beforehand, preconceive, preconclude, predecide, predetermine, prejudge, presume, presuppose, presurmise, squirm, stew, sweat, sweat and stew, sweat it out, wait impatiently, win the start
