do 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.
do someone a power of goodand 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.
do a power of good, to
To effect a great improvement. This somewhat unsophisticated turn of phrase uses “power” in the sense of “much” or “a great deal.” For example, “Those vitamins will do her a power of good.”