Definition from Wiktionary, the free dictionary
- An experience or event that reveals, enlightens, or informs; something that causes learning, revelation, realization, or increased awareness.
- A visit to the slaughterhouse was a real eye-opener to anyone who thought they understood where their food came from.
- An alcoholic beverage consumed first thing in the morning. A euphemism used by those offering or consuming alcohol in the morning.
- As soon as I got on the plane I asked the flight attendant for an eye-opener, but all he had to offer was orange juice.