chaise longue UK /ˌʃeɪz ˈlɒŋ(ɡ)/US /ˌʃeɪz ˈlɔŋ/ noun1 •A reclining chair with a long seat, which can support the outstretched legs of a sitter normally with one armrest.Hey, you, over there / On the chaise longue, in your underwear / What are you doing sitting down? / You should be horizontal now — 2021 formschaise longues · chaises longues