do (one) a power of good

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

do someone or something a power of good

be very beneficial to someone or something. informal
See also: good, of, power, someone, something