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upon - definition and synonyms

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preposition     upon pronunciation in American English
  1. 1
    literary on or onto something

    He believes we were put upon this earth for a purpose.

  2. 2
    formal used after some verbs with the same meaning as “on”

    They draw upon their experience to educate and guide new companies.

    My whole future depended upon the decision of this one manager.

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  3. 3
    formal immediately after doing something or after something happens

    His first act upon taking office was to repeal the luxury tax.

    Upon his release, Davis went immediately to his mother’s.

  4. 4
    if an event or time is upon you, it is going to happen very soon

    The fall TV season is upon us.

  5. 5
    used between two nouns that are the same for emphasizing that there is a large number of the thing that you are mentioning

    I’ve written to you, year upon year, and never heard from you.

    We drove across mile upon mile of wide-open space.

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to manipulate someone psychologically so that they begin to question their own perceptions and memories

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Dunning-Kruger effect

the phenomenon by which an incompetent person is too incompetent to understand his own incompetence

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