dah

n. countable

C2 Proficiency US //ˈdə// UK //dˈɑː// dah

Definition

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

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

SIMPLE

The letter 'M' is represented by two dahs.

CONTEXTUAL

In Morse code, the letter 'O' consists of three consecutive dahs, making it easy to identify in an emergency signal.

COMPLEX

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.

Etymology 1

Imitative

Etymology 2

From Burmese ဓား (dha:). Possibly a doublet of dao.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Usage

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

Last updated May 8, 2026