swansong
/ˈswɒnsɒŋ/noun
- a person's final public performance or professional activity before retirement（退休前的）告别演出; 最后的职业活动：
he has decided to make this tour his swansong.
他决定把这次巡回演出作为最后的告别演出。
词源
early 19th cent.: suggested by German Schwanengesang, a song like that fabled to be sung by a dying swan.