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

What about that brother who shouted, "Let him have it"?

那个大喊"给他一枪"的兄弟呢

耶鲁公开课 - 心理学导论课程节选

Actually, he said, "Give me the gun."

实际上,他说的是"把枪给我"

耶鲁公开课 - 心理学导论课程节选