
Do somebody a power of good
Positive Change
Phrase implies a significant and positive change in someone's condition or mood.

The good news from home will do him a power of good.
Colloquial Use
Used in informal conversations among friends or family, not in formal writing or speeches.

You look stressed; some time off would do you a power of good.
Emotional Support
Often refers to emotional or psychological benefit, not just physical.

Talking to a counselor will do her a power of good.
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