jump the gun

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jump the gun [idiom]

To act hastily and without thinking

Example: 

Don’t jump the gun on it. I’ll tell Ely about the proposal before it’s the right time or you’ll spoil the surprise.

Longman Dictionary of Contemporary English

11 jump the gun to start doing something too soon, especially without thinking about it carefully

Oxford Advanced Learner's Dictionary

jump the gun

jump the ˈgun idiom

to do sth too soon, before the right time

Cambridge Advanced Learner's Dictionary

Cambridge Advanced Learner's Dictionary - 4th Edition
 

jump the gun

to do something too soon, especially without thinking carefully about it:

They've only just met - isn't it jumping the gun to be talking about marriage already?

© Cambridge University Press 2013

Merriam-Webster's Advanced Learner's Dictionary

jump the gun informal : to start or do something too soon
• Several racers jumped the gun. [=started to race before the starting gun was fired]
• The newspaper jumped the gun [=acted too soon] and announced the wrong candidate as winner of the election.