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A Klaxon is a very loud electric horn. books picture it on police cars and other official vehicles in the past — the sharp blast that meant “move, now.” People also use it as a verb: to klaxon is to sound that horn. Though actually, the tidy police-car picture is narrower than how English has used the word. It began as a brand name for a machine that made a hard, screaming note, the old ah-OO-gah kind you still hear in films, and writers later stretched it to factory alarms, ships, and any horn that will not let you ignore it. In ordinary talk now many people just say horn or . Klaxon feels a little old, or a little like a story. Because it began as a trademark, some writers still give it a capital K.
警報喇叭、汽笛（舊時公務車那種又尖又響的；不是家用小喇叭）
組成It does not split into English pieces. It began as the trademark Klaxon, based on Ancient Greek klázō, “make a sharp sound; scream.” The name was coined by Franklyn Hallett Lovell Jr.; his company in Newark, New Jersey, licensed the sound-making machine in 1908 from the inventor Miller Reese Hutchison.
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
klaxonnoun/ˈklæksən/
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A loud electric alarm or horn, especially as used in automobiles in the early 20th century.
- And she went so swiftly that he could only follow her to the door. The large shape of the car swallowed her up; and the car twisted softly around the little drive and away to the London road. Minutes later he heard its Klaxon, just one sharp keen, like the harsh cry of a sea-bird. …
- There was a motor car behind them now and it blasted into the truck noise and the dust with its klaxon again and again; then flashed on lights that showed the dust like a solid yellow cloud and surged past them in a whining rise of gears and a demanding, threatening, bludgeoning of klaxoning.
klaxonverb/ˈklæksən/
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To produce a loud, siren-like wail.
- He headed down the Embankment. It was noon precisely. Big Ben klaxoned the hour with blasts of servo whistle.
- Suffering. It was like a great discordant symphony ringing out from the world; like a klaxoning of a million million cracked bells.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。