know about
verb- Used other than figuratively or idiomatically: see know, about.
- To have positive inclinations regarding (someone or something); to have no doubts regarding (someone or something). · I don't know about him.· You never know about that family.
From the library
“Then tell me all you know about the Catalane.”
“Hold your tongue, you fool!—what should you know about it?—why, you were drunk!”
“Then how do you know about his rooms?”
“Well, I don’t know about Californians.
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