Made a short, high-pitched sound; or signaled with such a sound, especially referring to electronic devices.
From 'beep,' an onomatopoeia (imitation of a sound) that became common with electronic devices in the 20th century. The '-ed' creates the past tense.
Beep is pure onomatopoeia—it imitates the sound!—yet we didn't have this word before electronic devices existed. English created the word to name a sound that didn't exist in nature until humans invented it.
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