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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.
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.