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Definition of Wake-up call
1. Noun. A warning to take action concerning something that was overlooked or neglected. "The bombing was a wake-up call to strengthen domestic security"
Generic synonyms: Warning
2. Noun. A telephone call that you request be made a specific time in order to wake you up at that time (especially in hotels). "She left a wake-up call for 7 a.m."
Definition of Wake-up call
1. Noun. A telephone call to awaken someone at a certain time, especially one requested by the person while staying at a hotel. ¹
2. Noun. (figuratively) An alert, reminder, or call to action caused by a dramatic event. ¹
¹ Source: wiktionary.com