Answer: jumpthegun

AnswerCrossword Clue
JUMPTHEGUN

Act too quickly

JUMPTHEGUN

Start too early

JUMPTHEGUN

Act too hastily

JUMPTHEGUN
Start too soon
JUMPTHEGUN
Get a head start: Colloq.
JUMPTHEGUNAct prematurely: Slang.
JUMPTHEGUNBe too hasty