Answer: JUMPTHEGUN

AnswerCrossword Clue
JUMPTHEGUNAct too quickly
JUMPTHEGUNStart too early
JUMPTHEGUNAct too hastily
JUMPTHEGUNStart too soon
JUMPTHEGUNGet a head start: Colloq.
JUMPTHEGUNAct prematurely: Slang.
JUMPTHEGUNBe too hasty