What does klaxon mean?
A klaxon is a powerful warning device, traditionally an electric horn fitted to vehicles, factories, ships, or public buildings. Its name became associated with the forceful, penetrating sound made by such devices, so that a loud alarm may also be described as a klaxon. The word is especially common in British English, although it is understood in American English as well. In everyday use, it usually suggests urgency: a vehicle approaching too closely, a warning at a factory, an air-raid signal, or another circumstance demanding immediate attention. As a verb, “to klaxon” means to sound a warning horn, and it often describes the distinctive noise itself. Although a klaxon is distinguished from an ordinary horn by the former’s greater volume and urgency, both terms can describe vehicle warning devices. The word remains useful because it captures not merely an alarm but an unmistakably loud and attention-commanding sound.
A loud-sounding warning horn or alarm, especially one fitted to a vehicle, factory, or other installation; also the sound produced by such a device.
"The sudden blast of the klaxon startled everyone in the street."
The device sense is now dominant, while the sound sense is common in phrases such as “the klaxon sounded.” The word is especially associated with British usage.
To sound a klaxon or make a loud, warning-horn-like noise.
"The truck klaxoned impatiently outside the depot."
This use is chiefly British and is more often used to describe the sound of a vehicle than the deliberate action of operating a horn.
The regular plural is used when referring to multiple warning devices; for example, “two klaxons.”
"The old sirens were replaced by electronic klaxons."
A klaxon turns a simple warning into an unmistakable, impossible-to-ignore roar.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does klaxon come from?
The word entered English in the late 19th century from French “klaxon,” which was based on the imitative Greek verb klazō, meaning “to cry out” or “to make a sharp sound.” It was initially associated with warning horns and sirens designed to produce an immediately recognizable noise. The shorter form “klax” and the spelling variant “claxon” also reflect the word’s imitative sound and early history.
Related word forms
How klaxon is actually used
Most often used for a vehicle horn, factory alarm, or similar device. The expression is somewhat old-fashioned and formal in British English, while American speakers may more commonly say “horn” or “siren.” As a verb, it is chiefly British and less common than the noun.