first wind of the season; first autumn wind
Archaic seasonal word, especially for the first wind of autumn. Rare in modern conversation; mostly encountered in classical poetry or historical contexts.
The first wind of autumn blew, making us feel the arrival of fall.
Compound of 初 (hatsu, 'first') and 風 (kaze, 'wind'). The exact historical derivation is uncertain, but the word follows a common pattern for seasonal firsts in classical Japanese.