Definition of «to jump the gun»

The phrase "to jump the gun" means to act too quickly or prematurely without waiting for the right time or proper signals.

So don't jump the gun on wedding planning just yet, make sure you've talked about it and agree on a time frame and other details. (wittynpretty.com)
You sure you're not jumping the gun on that one? (nintendoenthusiast.com)
I was wrong and I now think that people jump the gun by trying to «move on» way too soon. (datinggoddess.com)
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