To make a short, sharp sound on a horn or whistle; also the plural noun for those sounds.
From imitative origin, mimicking the sound made by a horn or whistle. The word appears to be English in origin, with -s marking either third-person singular or plural.
Train horns don't actually say 'toot'—they produce a complex sound that engineers call a 'dynamic pressure wave,' but 'toot' is so good at capturing the feeling that we use it anyway!
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