noun
west wind in early spring; wind that blows seashells ashore
Traditional seasonal term for a west wind around the 20th day of the second lunar month, said to blow shells onto the shore. The literal meaning is 'shell-gathering wind'. Rare in modern everyday use; mainly encountered in literary or historical contexts.
貝寄せの風が吹くと、浜にたくさんの貝が打ち上げられるという。
They say that when the kaiyose wind blows, many shells are washed up on the beach.
旧暦二月二十日の夜、貝寄せと呼ばれる西風が吹く。
On the night of the 20th day of the second month of the lunar calendar, a west wind called kaiyose blows.
Compound of 貝 (kai, 'shell') + 寄せ (yose, 'gathering'), from the verb 寄せる (yoseru, 'to bring near'). The name reflects the belief that this wind drives shells onto the shore.