alarm clock

noun

: a clock that can be set to sound an alarm at a desired time

Examples of alarm clock in a Sentence

She set the alarm clock for six o'clock.

The alarm clock went off at six o'clock.

Recent Examples on the Web

In practice, this can mean swapping a glowing alarm clock for a traditional one with moving hands, or replacing scrolling with listening to vinyl. —Jacorey Moon, Architectural Digest, 12 Mar. 2026

If waking before sunrise, Dr. Kogan suggests using a light-simulating alarm or turning on bright lights to help activate your body’s internal alarm clock. —Kate Donovan, Martha Stewart, 8 Mar. 2026

The invention of electricity made menial jobs like the lamplighter, the elevator operator, and the knocker-up, the human equivalent to the modern alarm clock, irrelevant. —Jake Angelo, Fortune, 6 Mar. 2026

From a reputable air purifier that doubles as a sunrise alarm clock to an ergonomic pillow designed for side sleepers, here’s what’s worth checking out this weekend. —Mariana Best, Better Homes & Gardens, 5 Mar. 2026

Word History

First Known Use

1662, in the meaning defined above

Rhymes for alarm clock

• aftershock
• antiknock
• arawak
• hollyhock
• interlock
• isopach
• manioc
• shuttlecock
• tomahawk
• weathercock
• alcock
• beanstalk

Kids Definition

alarm clock

noun

: a clock that can be set to sound an alarm at any desired time