# dah

/ˈdə/ (US) · /dˈɑː/ (UK) · CEFR C2 · Noun

Source: https://englishreference.com/word/dah
Updated: 2026-05-08

## Definition

the long sound used in Morse code. It is three times as long as the short sound, which is called a 'dit'.

For teachers: the phonetic representation of a dash in Morse code, representing a long signal. Typically paired with 'dit' to describe sequences of signals.

## Examples

- The letter 'M' is represented by two dahs.
- In Morse code, the letter 'O' consists of three consecutive dahs, making it easy to identify in an emergency signal.
- While a dit represents a single unit of time, a dah is equivalent to three units, establishing the rhythmic foundation necessary for clear telegraphic communication over long distances.

## Usage notes

- Often used in combination with 'dit' to vocalize Morse code patterns.

---

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.