单词	barrel-and-pin
释义	barrel-and-pin adjective bar·​rel-and-pin : having or consisting of a rotating cylinder studded with pins or pegs and used in a mechanical musical instrument (such as a music box, barrel organ, or barrel piano) to activate the instrument's sound-producing mechanism … there is the spring, which pumps the little bellows and works the little barrel-and-pin device that releases the air into the pipes that make the whistle. Robertson Davies, World of Wonders, 1975 Word History First Known Use 1944, in the meaning defined above
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