Meaning of “say a lot about something/someone” in the English Dictionary

american-english dictionary

"say a lot about something/someone" in American English

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say a lot about something/someone

to clearly show or express something about someone or something:

It says a lot about her that she's willing to help people she doesn't even know.
I think the way someone dresses says a lot about their character.

(Definition of “say a lot about something/someone” from the Cambridge Academic Content Dictionary © Cambridge University Press)