tailcoat

noun
🔊/ˈteɪlkəʊt/
🔊/ˈteɪlkəʊt/
[countable]
(also informal tails [plural])
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  1. a long jacket divided at the back below the waist into two pieces that become narrower at the bottom, worn by men at very formal events 燕尾服;男子晚礼服compare dinner jacket