"[kill] two birds with one stone" 的定义和意义

What is the origin of the idiom "kill two birds with one stone" and when to use it?

The idiom "kill two birds with one stone" is believed to have originated from a literal interpretation of the act of throwing stones to hit and kill birds. This expression is used to describe the act of achieving two goals or completing two tasks with a single effort or action. It emphasizes efficiency and the ability to address multiple objectives simultaneously, as opposed to separate or individual actions for each.