ଅର୍ଥ : A warning to take action concerning something that was overlooked or neglected.
ଉଦାହରଣ :
The bombing was a wake-up call to strengthen domestic security.
ଅର୍ଥ : A telephone call that you request be made a specific time in order to wake you up at that time (especially in hotels).
ଉଦାହରଣ :
She left a wake-up call for 7 a.m..