Definitions
There are 2 meanings of the phrase
Wake-Up Call.
Wake-Up Call - as a noun
A warning to take action concerning something that was overlooked or neglected
Example: "The bombing was a wake-up call to strengthen domestic security"
A telephone call that you request be made at a specific time in order to wake you up
Example: "She left a wake-up call for 7 a.m."
Example Sentences
"Missing deadlines was a wake-up call for me to improve my time management skills."
"The poor performance of our team in the match served as a wake-up call for us to train harder."
"The sudden heart attack was a wake-up call for him to prioritize his health."
"Failing the test was a wake-up call for her to study more diligently."
"Losing his job was a wake-up call for him to reassess his career choices."