揺よう蕩とう

noun, noun or participle which takes 'suru'

shaking; swaying

Archaic noun or suru-verb describing a shaking or swaying motion. Not used in modern everyday Japanese; found mainly in classical literature or poetic language.

• 古ふるい和わ歌かに「舟ふねの揺よう蕩とう」という表ひょう現げんが見みられる。

  In old waka poetry, one can find the expression 'the swaying of the boat'.