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coda (n.)

"passage added to a musical composition for the purpose of bringing it to a conclusion," 1753, from Latin cauda "tail of an animal," which is of uncertain origin. De Vaan traces it to Proto-Italic *kaud-a- "part; tail," from PIE *kehu-d- "cleaved, separate," from root *khu-. He writes: "Since words for 'piece, part' are often derived from 'to cut, cleave', the tail may have been referred to as the loose 'part' of the animal."