do good

verb — 2 senses

do good

verb

1

To act virtuously.

2

To contribute positively; to aid.

(A) fat lot of good that does me.
That's all there is to it. It might do you some good to know him better anyhow.2021, Michael Farris Smith, chapter 40, in Nick, New York; Boston; London: Little, Brown and Company, page 196:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.