noun
Frost Descent; solar term around October 23
The 18th solar term in the traditional East Asian calendar, marking the time when frost begins to appear. Used mainly in calendar contexts.
See also: 二十四節気
霜降は二十四節気の一つで、10月23日ごろにあたります。
Sōkō is one of the 24 solar terms, falling around October 23.
二十四節気 is the full set of 24 solar terms; 霜降 is one specific term within that system.
From Chinese 霜降 (shuāngjiàng), literally 'frost descent'. The term was adopted into the Japanese traditional calendar system.