dinner jacket
noun [ C ] UK uk/ˈdɪn.ə ˌdʒæk.ɪt/ us/ˈdɪn.ɚ ˌdʒæk.ɪt/ (abbreviation DJ); (US tuxedo)
（指男式）晚礼服
a man's black or white jacket worn at formal social events, usually in the evening, with matching trousers and a bow tie
Compare: black tie