1
general::
Act in an upright, moral way; engage in philanthropy. For example, Social workers are trained to help people to help themselves, not simply going around doing good. This term was first recorded in A.D. 725. Also see DO ANY GOOD; DO ONE GOOD.
American Heritage Idioms
2
general::
Phrase(s): do someone good
to benefit someone. • A nice hot bath really does me good. • A few years in the army would do you good.
McGrawhill's American Idioms And Phrasal Verbs