Around-the-clock (adjective)

1. Continuous, non-stop, running all the time.
2. Performed or available at all times, 24 hours a day.

Origin:

Phrase originated from clock, meaning during the entire day and night.

Examples:

1. The hospital has around-the-clock nursing care.
2. The factory operates around-the-clock to meet demand.
3. The store is open around-the-clock for convenience.
4. The company provides around-the-clock customer service.
5. The city has around-the-clock surveillance to ensure safety.