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Difference between Say a lot about something and Say a lot for something

say a lot about something—(also: tell a lot about something) be very significant or revealing about smth.:

  • This says a lot about our society and the direction in which we are moving.

say a lot for something—give ample proof in favor of smth.; be strong evidence of smth.:

  • Sprucing up the place of business with newly-cleaned carpeting, for example, will say a lot for the health of a company.