do a power of good

• do the power of good

From do good + a power of (“a lot of”).

do a power of good (third-person singular simple present does a power of good, present participle doing a power of good, simple past did a power of good, past participle done a power of good)

1. (UK, transitive, intransitive) To be highly beneficial (to someone).

   Synonyms: do a world of good, do the world of good

   A spell in the army will do these delinquents a power of good.

   I feel much better. The week at the health spa did a power of good.

• do a fat lot of good

• “do a power of good”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.
• “do someone a power of good”, in Cambridge English Dictionary, Cambridge, Cambridgeshire: Cambridge University Press, 1999–present.
• “do somebody a power of good” in Longman Dictionary of Contemporary English, Longman.