of or befitting a do-gooder.
Origin of do-good
First recorded in 1965–70; back formation from do-gooder
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.