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English definition of “wake-up call”

wake-up call

noun [C]    
if something is a wake-up call, it makes you realize that you need to change the way you do something, to avoid a problem in the future: The 30% drop in annual profits served as a real wake-up call for high-street retailers.
a phone call that a hotel guest can arrange to get to wake them up at a particular time: I'd like a wake-up call at 7, please.
(Definition of wake-up call noun from the Cambridge Business English Dictionary © Cambridge University Press)
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