Definition of wake-up call
1
: something (such as a telephone call from a hotel employee to a guest) that serves to wake a sleeper
2
: something that serves to alert a person to a problem, danger, or need
a wake-up call to parents
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Merriam-Webster unabridged
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Time Traveler for wake-up call
The first known use of wake-up call was in 1974
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