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English definition of “eye-opener”

eye-opener

noun [C usually singular] uk   /ˈaɪˌəʊ.pən.ər/ us    /-ˌoʊ.pən.ɚ/
something that surprises you and teaches you new facts about life, people, etc.: Living in another country can be a real eye-opener.Surprising and shockingMaking people sad, shocked and upset
(Definition of eye-opener from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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