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1. To have a positive effect on someone. In this usage, a noun or pronoun is used between "do" and "good." If you're feeling sad, getting out in the sunlight should do you good.
2. To focus one's energy on charitable acts. In this usage, "do good" is a set phrase. Monica has always been one to do good, so I'm not surprised to hear that she joined the Peace Corps.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
do someone good
to benefit someone. A nice hot bath really does me good. A few years in the army would do you good.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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.
do one good
1. Be of benefit to one, as in I'm sure some fresh air will do her good. [Late 1400s]
2. Also, do one's heart good. Please, gratify, give satisfaction. For example, It does my heart good to see the young couple so happy.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
do ˈgoodbe kind and generous to people who need help, for example by working for a charity: She tries to do good by visiting prisoners’ families when she can. ▶ ˌdo-ˈgooder noun (informal, disapproving) a person who tries to help others but does it in a way that is annoying
do somebody ˈgoodhelp somebody; have a good effect on somebody: A trip to the beach would do you a lot of good.
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