One of the mysteries of the English language finally explained.
With plural and singular concord. In horn playing: notes stopped by the insertion of the hand into the bell. Also as adverb: a musical direction indicating this.
Early 20th century; earliest use found in Proceedings Musical Association. From French sons bouchés, plural noun, lit. ‘blocked sounds’ from the plural of son sound + bouchés, masculine plural past participle of boucher.
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