When you're working around the clock, you're busy all day and all night long. Around the clock means for an entire 24-hour day. The phrase around the clock is used most commonly when someone is hard at work, or is doing something difficult.

What does the phrase working around the clock mean?

: being in effect, continuing, or lasting 24 hours a day : constant around-the-clock surveillance.

Is working around the clock an idiom?

“Around the clock” is a lovely visual idiom – you can even picture the hands of the clock spinning around the clock face as you say it!