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Definition of eye-opener noun from the Oxford Advanced Learner's Dictionary

eye-opener

noun
 
/ˈaɪ əʊpənə(r)/
 
/ˈaɪ əʊəpənər/
[usually singular]
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  1. an event, experience, etc. that is surprising and shows you something that you did not already know
    • The journey so far had been a real eye-opener.
See eye-opener in the Oxford Advanced American Dictionary
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