light weightA lightweight is someone who cannot drink much alcohol. “Tim is such a lightweight. He passed out after drinking one beer.” Light weight means something isn’t heavy. I probably wouldn’t.
In drinking, lightweight means someone who gets drunk easily and heavyweight means someone who does not get drunk easily. In fighting, like boxing or wrestling, lightweight and heavyweight are weight.
In British English a railcar usually refers to a lightweight vehicle that runs on rails, e.g. one of one or two passenger coaches almost like a bus. A train tends to refer to a heavier vehicle. We'd call the.
