do (one) a power of good

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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.
See also: good, of, power

do someone a power of good

 and do someone a heap of good
Rur. to be very good for someone. You should take a vacation. It'd do you a power of good. Just hearing your voice does me a heap of good.
See also: good, of, power