jump the gun

Related to jump the gun: keep one's nose to the grindstone

jump the gun

To start something before it is permissible, appropriate, or advisable. The phrase alludes to starting to run in a foot race before the starting gun goes off. Henry jumped the gun and sent the proofs to the printer before the boss approved them, and she was not happy. I probably jumped the gun with announcing our engagement before everyone was there, but I was just too excited.
See also: gun, jump
Farlex Dictionary of Idioms.

jump the gun

Fig. to start before the starting signal. (Originally used in sports contests that are started by firing a gun.) We all had to start the race again because Jane jumped the gun. When we took the test, Tom jumped the gun and started early.
See also: gun, jump
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

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]
See also: gun, jump
The American Heritage® Dictionary of Idioms by Christine Ammer.

jump the gun

COMMON If someone jumps the gun, they do something before the right time. `How about going out to celebrate?' — `I haven't definitely got the job yet so let's not jump the gun.' The book wasn't due to be released until September 10 but some booksellers have jumped the gun and decided to sell it early. Note: If a runner jumps the gun, they begin running before the pistol is fired to start the race.
See also: gun, jump
Collins COBUILD Idioms Dictionary, 3rd ed.

jump the gun

act before the proper or appropriate time. informal
In athletics, a competitor who jumps the gun sets off before the starting pistol has been fired. The expression appears in the early 20th century as beat the gun .
See also: gun, jump
Farlex Partner Idioms Dictionary

jump the ˈgun

(informal) do something before the right time: They jumped the gun by building the garage before they got permission from the town council.
This idiom refers to an athlete in a race who starts running before the starter has fired the gun.
See also: gun, jump
Farlex Partner Idioms Dictionary

jump the gun

tv. to start too soon; to start before the starting signal. The secretary jumped the gun and gave out the letters too soon.
See also: gun, jump
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions

jump the gun

To start doing something too soon.
See also: gun, jump
American Heritage® Dictionary of the English Language, Fifth Edition.

jump the gun, to

To act prematurely or too hastily. The term comes from the starter’s gun that often marks the beginning of a race, and those who “jump” the gun are starting before the gun goes off. At first this was expressed as to beat the pistol (ca. 1900), but by 1942 the American Thesaurus of Slang (by Berrey and Van den Bark) defined jump the gun as “to make a false start.” The British journal The Economist has been very fond of this expression since about 1950.
See also: jump
The Dictionary of Clichés by Christine Ammer
See also:
  • jump the gun, to
  • off the (starting) blocks
  • off the blocks
  • from that day/time forth
  • (not) up to scratch
  • be in pole position
  • take a gamble
  • learn (something) the hard way
  • learn the hard way
  • bring (something) full circle
References in periodicals archive
"We are all farmers and no one wants to jump the gun but a carefully managed resumption could now take place in areas least affected and least at risk from foot and mouth.
Unfortunately, people at PSV, the player and his advisers decided to jump the gun ...
Trapattoni also fired a no-nonsense warning to his players when he warned them not to jump the gun.
Pele, Ferenc Puskas, Gerd Muller and Gabriel Batistuta have hit the half-century and Keane said: "I don't want to jump the gun too quickly but now I am climbing close, of course it would be great to achieve it.
But earlier the former HomeSecretary appeared to jump the gun by admitting defeat for Labour.
After watching a replay of the incident it was easy to jump the gun and criticise the Birmingham player Taylor but further replays proved the tackle was not malicious.
He said: "We won't jump the gun.We're off the back of six straight defeats."
"If people want to jump the gun a bit then that's their problem."