◆to jump the gun or to beat the gun
runner +发令枪未响即开跑；偷跑；抢跑
<非正式>(act prematurely)提前行动；过早地行动
It wasn't due to be released until September 10, but some booksellers have jumped the gun and decided to sell it early.这本书按计划9月10日才上市, 但是一些书商却决定提前开始销售。
Let's not jump the gun.咱们不要提前行动。