do (one) a power of good
To be very beneficial to one. If you're feeling sad, getting out in the sunlight should do you a power of good. Going on vacation—and getting away from all this work stress—will do me a power of good. If I could just get a decent night's sleep, I know it would do me a power of good.
do (one) a/the world of good
To have a very positive effect on someone or something. If you're feeling sad, getting out in the sunlight should do you a world of good. Going on vacation—and getting away from all this work stress—will do me a world of good. If I could just get a decent night's sleep, I know it would do me a world of good.
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