Do somebody/something a power/world of good - Idioms by The Free Dictionary
do somebody/something a power/world of good
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.
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.