Idiom: "to be an eye-opener"
Example:
Darryl and John are talking...
Darryl: Did you know that the average household in California uses more than 350 gallons of water a day? That's over 1325 liters everyday!
John: Each house?! That's a real eye-opener!
Meaning: An eye-opener is a shocking or surprising piece of news. It's something unexpected that makes you think differently about a situation or about the world.
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