read somebody like a book
US /riːd ˈsʌm.bə.di laɪk ə bʊk/
UK /riːd ˈsʌm.bə.di laɪk ə bʊk/
1.
to understand someone's thoughts, feelings, and motives very well, as if you are reading a book
:
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She knows me so well; she can read me like a book.
•
After years of working together, I can read him like a book.