冴さえ行ゆく

godan verb (iku/yuku class), intransitive verb

clear gradually; get cold gradually

Describes a gradual change: the sky or weather becoming clearer, or the air becoming colder. Often used in literary or descriptive contexts.

• 夜よるが更ふけるにつれて空そらが冴さえ行ゆく。

  As the night deepens, the sky clears gradually.

• 秋あきが深ふかまり、空くう気きが冴さえ行ゆく。