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3. do a power of good

do a power of good

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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 a power of good

  (informal)

to make someone feel much better That walk in the fresh air did me a power of good.

See also: good, of, power