noun, noun or participle which takes 'suru'
long blast of a ship's horn
Nautical term for a prolonged sound signal from a vessel's horn, often used in fog or as a warning.
霧の中で船が長声を鳴らした。
The ship sounded a long blast in the fog.
Compound of 長 (long) and 声 (voice/sound), referring to a prolonged sound signal.