It's called an "idiom". Like any other idiom, including idioms in naturally language, you have to learn it. That doesn't mean it's not useful. If people run into it and are not familiar with it, they'll figure it out quickly and then know it themselves.
It's called an "idiom". Like any other idiom, including idioms in naturally language, you have to learn it. That doesn't mean it's not useful. If people run into it and are not familiar with it, they'll figure it out quickly and then know it themselves.
I completely agree with you.