1. something that provides a surprising or enlightening revelation
Usage: informal
2. an alcoholic drink taken early in the morning
Usage: informal; slang

Examples

• The documentary about climate change was a real eyeopener for many viewers.
• Her first day at the hospital was an eyeopener about the realities of medical work.
• The statistics on poverty in the city were quite an eyeopener.
• Meeting people from different cultures was an eyeopener for the students.
• The financial audit results were an eyeopener for the company’s board.
• His grandfather always had an eyeopener with his morning coffee.