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know

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1 to have a practical understanding of
  • a career diplomat who knows several languages
  • a fan who really knows baseball
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2 to come to a knowledge of (something) by living through it
  • knows full well how nerve-racking it can be to speak in public
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3 to have a clear idea of
  • I think I know what you're trying to say
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to boil down or concentrate

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