# black day

idiom

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

## Meaning

A day of great disaster, misfortune or unhappiness.

## Examples

- Today was a black day for our team.
- After the company announced the sudden layoffs, everyone agreed it was a black day for the entire office.
- History remembers the market crash as a black day, marking the start of a long and painful economic depression for the nation.

---

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.