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to do something too soon, especially without thinking carefully about it (Originally used in sports contests that are started by firing a gun. If someone running in a race jumps the gun, they start running before the gun has been fired to start the race.)
He shouted at me before I had time to explain, but later he apologised for jumping the gun (jump the gun).
by nemez January 14, 2011
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2
to do something prematurely
I think I jumped the gun on calling her "bitch." she won't talk to me anymore, I guess it was too early.
by bitch November 21, 2002
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