jump the gun
過早地行動；做事沖動
口語·形容沖動或過早行動
英文釋義
to start doing something too soon, before it is appropriate or before the necessary preparations have been made
例句
He jumped the gun and announced the news before it was official.
典故來源
源自田徑比賽，發令槍響前起跑即犯規，比喻過早行動。