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Definitions of unbeknown
  1. adverb
    without someone's knowledge
    "unbeknownst to me, she made all the arrangements"

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  2. adjective
    (usually used with `to') occurring or existing without the knowledge of
    "a crisis unbeknown to me" "she had been ill for months, unbeknownst to the family"

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Explanation of unbeknown
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