jump the gun
Start doing something too soon, act too hastily. For example, The local weather bureau jumped the gun on predicting a storm; it didn't happen for another two days. This expression alludes to starting a race before the starter's gun has gone off, and supplants the earlier beat the pistol, which dates from about 1900. [Mid-1900s]
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How to use jump the gun in a sentence
France 24 is providing live, round-the-clock coverage of both scenes as they progress.
Sands was involved in a scandalous-for-the-time romance with the carpenter and there were rumors she was pregnant with his child.New York’s Most Tragic Ghost Loves Minimalist Swedish Fashion|Nina Strochlic|January 8, 2015|DAILY BEAST
Three on-the-record stories from a family: a mother and her daughters who came from Phoenix.I Tried to Warn You About Sleazy Billionaire Jeffrey Epstein in 2003|Vicky Ward|January 7, 2015|DAILY BEAST
“You can imagine the sound of that gun on a Bronx street,” Chief of Detectives Robert Boyce says.
The collection includes kimono capes and hand woven jump overalls.The Photographer Who Gave Up Manhattan for Marrakech|Liza Foreman|January 6, 2015|DAILY BEAST
Sleek finds it far harder work than fortune-making; but he pursues his Will-o'-the-Wisp with untiring energy.
The sound of my step shall make your heart jump; a look from me shall make you dumb for an hour.Checkmate|Joseph Sheridan Le Fanu
This was no strange sight to the boy by that time, but it was awkward in the circumstances, for he had neither gun nor spear.The Giant of the North|R.M. Ballantyne
He turned at the sound of my voice with vastly more concern than he'd betrayed under the muzzle of Piegan's gun.Raw Gold|Bertrand W. Sinclair
We haven't even seen a review of the piece; the footlights go up with a jump, and now the curtain rises.