alarm clock
type of clock used to wake up a sleeping person at a certain time; formerly mechanical and hand-wound, today with quartz movement
en-US/əˈlɑɹm ˈklɑk/
en-GB/əˈlɑːm ˈklɒk/
type of clock used to wake up a sleeping person at a certain time; formerly mechanical and hand-wound, today with quartz movement