他一枪就撂倒了那头熊。

He brought down the bear with a single shot.

《牛津词典》

他开车通过的时候，有人向他乱开了一枪。

Somebody took a potshot at him as he drove past.

《牛津词典》

最后，猪大战结束了，只开了一枪。

Finally, the Pig War was over and only one shot was fired.

youdao

It could mean "Shoot him, let him have it," or it could mean "Give him the gun, let him have it."

可以是说"开枪吧,给他一枪",也可以是说"给他吧,把枪给他"

耶鲁公开课 - 心理学导论课程节选

The retarded brother shouted, "Let him have it," whereupon the brother shot and killed the police officer.

发育迟缓的兄弟大喊,"给他一枪",于是他的兄弟开枪射杀了这名警官

耶鲁公开课 - 心理学导论课程节选

You can poison them, you can strangle them, you can shoot them in the heart.

你可以下毒或是勒死他们,你可以朝他心脏开一枪

耶鲁公开课 - 死亡课程节选