noun Date: 1976 something (as a telephone call from a hotel employee to a guest) that serves to wake a sleeper, something that serves to alert a person to a problem, danger, or need
WAKE-UP CALL
Meaning of WAKE-UP CALL in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012