know (someone or something) through and through

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know (someone or something) through and through

To have a thorough and complete knowledge of someone or something. I know Elizabeth through and through, so I really doubt that she's mad at you. A: "You can recite 'Nothing Gold Can Stay' from memory?" B: "Sure, I know it through and through."
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know something through and through

to know something very well. I want you to know this project through and through before the staff meeting. I know my part in the play through and through.
See also: and, know, through
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