# day or night

idiom

Source: https://englishreference.com/idiom/day-or-night
Updated: 2026-08-10

## Meaning

At any time; 24/7

## Examples

- My phone rings day or night.
- The emergency clinic is open day or night to help people with sudden health problems.
- The lighthouse keeper remained vigilant, watching the horizon day or night to ensure the safety of passing ships.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.