wake-up call

English Thesaurus

1. a telephone call that you request be made a specific time in order to wake you up at that time (especially in hotels) (noun.communication)

hypernym	:	call, phone call, telephone call,
definition	:	a telephone connection (noun.communication)

2. a warning to take action concerning something that was overlooked or neglected (noun.communication)

hypernym	:	warning,
definition	:	a message informing of danger (noun.communication)