/ ˈswɒnsɒŋ; NAmE ˈswɑːnsɔːŋ/ noun
[ sing. ] the last piece of work produced by an artist, a musician, etc. or the last performance by an actor, athlete , etc.
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WORD ORIGIN
early 19th cent.: suggested by German Schwanengesang , a song like that fabled to be sung by a dying swan.