風俗
ふうぞく · fuuzoku · JLPT N1 · noun
customs
🌬️🌾 風 wind + 俗 custom: how society's wind blows, and people bend like grass
Classical idea: a ruler's virtue is the wind and common people bend like grass, so 風俗 meant the prevailing customs. The sex-industry sense is a later narrowing, so check context.
俗 — person radical 亻 + valley 谷
A semantic-phonetic compound: 亻 (person) gives the meaning and 谷 (gǔ/valley) suggests the sound. Originally referred to the customs and habits of common people living in the valleys, later extending to mean 'common,' 'vulgar,' or 'secular' as opposed to refined or religious.