noun
A long seat for multiple people; can refer to a couch, sofa, bench, or settee depending on context. Often used for a sofa in a living room or a bench in a public space.
リビングに長椅子を置いた。
I put a couch in the living room.
公園の長椅子に座って本を読んだ。
I sat on a bench in the park and read a book.
Compound of 長 (naga, 'long') and 椅子 (isu, 'chair').