The last thing someone does in their working life or career — a final performance, a final book, a final match — especially one that is beautiful or impressive. A singer's last concert before retiring is her swansong; a player's last game for his club is his swansong. Two things give the word its flavour. First, it marks an ending that is planned or known: you usually call something a swansong when everyone understands this is the last one. Second, it carries a note of sadness and beauty together — the work is fine, and it is also goodbye. That is why it fits an artist's final album better than a shop assistant's last day. People also use it more loosely for the last appearance of anything before it disappears: the final model of a car, a party's last election win before it collapsed. You will see it written three ways — 'swansong', 'swan song', and 'swan-song' — and all are accepted, with 'swan song' most common in American writing. It is usually 'someone's swansong', with a possessive.

（藝人、運動員等的）最後一場演出、封筆之作、告別作；「天鵝之歌」。