Answer: jumpedthegun

AnswerCrossword Clue
JUMPEDTHEGUNBegan prematurely
JUMPEDTHEGUNWas premature
JUMPEDTHEGUNActed impetuously, N.R.A. style?
JUMPEDTHEGUNGot overeager
JUMPEDTHEGUNCommitted a track violation