jump the gun

35 Moby Thesaurus words for "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