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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 a world of 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.
do someone good
to benefit someone. A nice hot bath really does me good. A few years in the army would do you good.
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.