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eyeopener

[ahy-oh-puh-ner]
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noun
  1. an experience or disclosure that gives one a sudden realization or understanding: Her disclosures about her childhood were a real eyeopener.
  2. a drink of liquor taken early in the day and intended to wake a person up fully.

Origin of eyeopener

An Americanism dating back to 1810–20; eye + opener
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018