expression
each house of the Japanese parliament
Refers to both the House of Representatives (衆議院) and the House of Councillors (参議院) individually. Often used in formal or news contexts.
衆参各院で法案が審議された。
The bill was deliberated in each house of the Japanese parliament.
Compound of 衆 (shū, abbreviation for 衆議院, House of Representatives), 参 (san, abbreviation for 参議院, House of Councillors), 各 (kaku, each), and 院 (in, house/chamber).