柯林斯詞典dinner jacket (also dinner-jacket) (dinner jackets) 1. N-COUNT A dinner jacket is a jacket, usually black, worn by men for formal social events. (男子在正式社交聚會時穿的) 無尾禮服 返回 dinner jacket劍橋詞典a man's black or white jacket worn at formal social events , usually in the evening , with matching trousers and a bow tie （指男式）晚禮服 返回 dinner jacket