the stately gait of swans.

(pros.) a metrical verse of four lines each having seven groups of three syllables followed by a short syllable and a long syllable (uuu, u-u, u-u, u-u, u-u, u-u, u-u, u, - ).

the last notable creative work, musical concert, etc. of a person before retirement or death; the farewell work or song; swan-song.