Meaning: You can say something's an eye-opener if it's made you realize something you hadn't been aware of before.
- Al Gore's movie "An Inconvenient Truth" was a real eye-opener for me. I hadn't really understood how serious global warming was until I saw it.
- Cathy said her trip to Thailand was quite an eye-opener for her. She'd never realized before how beautiful Thailand was, or how friendly the people were.
Jenny and the other kids went on their first visit to the zoo today, and it was a real eye-opener for them. They