When you provide a specific example to illustrate an idea, you instantiate it. You say you believe in unicorns, but so far you haven't been able to instantiate that belief.

Philosophers often use this term, which can be most simply understood as "represent by an instance." A multi-millionaire may choose to instantiate their wealth by driving an extremely expensive car and wearing $500 shoes. A photojournalist might attempt to instantiate the dangers of a particular intersection by taking photos of car accidents that occur there. Whenever you clarify or explain a concept with a real-world example of it, you instantiate that idea.

Definitions of instantiate
  1. verb
    represent by an instance
    “This word instantiates the usage that the linguists claimed to be typical for a certain dialect”
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    type of:
    be representative or typical for
  2. verb
    find an instance of (a word or particular usage of a word)
    “The linguists could not instantiate this sense of the noun that he claimed existed in a certain dialect”
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    type of:
    detect, discover, find, notice, observe
    discover or determine the existence, presence, or fact of
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