do 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 somebody/something a ˈpower/ˈworld of good

(old-fashioned) do somebody/something a lot of good; benefit somebody/something: She’s under a lot of stress at work, and a few days at the coast would do her a power of good.

See also: good, of, power, somebody, something, world