One short, high, electronic sound, sent out to catch your attention. Press a button and a small clean note comes back. It carries no feeling of its own — it only says: look here.
beep 可以想成一個很短的高音「嗶」。這個聲音不是音樂，本身也不帶情緒。它存在的理由只有一個：要你抬頭看一眼。機器用它說「好了」「不對」「我收到了」；車子把同一個聲音放大，變成路上的提醒。所以不管是微波爐還是喇叭，畫面都一樣——一聲短音打斷你正在做的事。
From the word’s history
The source marks beep as onomatopoeic: the word is the sound, written down. That is why one word covers both the small machine tone and the loud horn — English never needed a second word, because both are the same noise at different volumes.
來源資料把 beep 標為擬聲詞：這個字就是照著聲音寫出來的。這說明了為什麼機器的小嗶和喇叭的大嗶共用一個字——對英文來說它們是同一種聲音，只是大小聲不同。
Wiktionary entry for beep (etymology 1), packet evidence kaikki:3f6f69a190036ae4:541042152 — "Onomatopoeic."
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