wake-up call

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. a warning to take action concerning something that was overlooked or neglected
- the bombing was a wake-up call to strengthen domestic security
• Hypernyms:
warning
2. 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.
• Hypernyms:
call, phone call, telephone call