Значение идиомы handsome is as handsome does

[handsome is as handsome does] {informal} A person must act welland generously so that he will be truly worth respecting. – A proverb.

Everyone thinks that Bon is a very handsome boy, but he is verymean too. Handsome is as handsome does.

Compare: FINE FEATHERS DO NOTMAKE PINE BIRDS.