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To perceive the truth or factuality of; to be certain of; to be certain that

• I know what you did.

  Я знаю, что ты сделал.

  Tatoeba · CK · CC BY 2.0 FR

• I know what I did.

  Я знаю, что я сделал.

  Tatoeba · CK · CC BY 2.0 FR

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To be or become aware or cognizant

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To be aware of; to be cognizant of

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To be acquainted (with another person)

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To be acquainted or familiar with; to have encountered

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To experience

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To understand or have a grasp of through experience or study

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To be able to distinguish, to discern, particularly by contrast or comparison; to recognize the nature of

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To recognize as the same (as someone or something previously encountered) after an absence or change

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To have knowledge; to have information, be informed

Knowledge; the state of knowing

• Tom is in the know.

  Tatoeba · Hybrid · CC BY 2.0 FR

• Mary is in the know.

  Tatoeba · Hybrid · CC BY 2.0 FR

Knowledge; the state of knowing — Now confined to the fixed phrase in the know.