Oxford Dictionary English tailcoat noun noun BrE BrE//ˈteɪlkəʊt// ; NAmE NAmE//ˈteɪlkoʊt// Add to my wordlistjump to other results a long jacket divided at the back below the waist into two pieces that become narrower at the bottom, worn by men at formal events synonym tailSee tailcoat in the Oxford Advanced American DictionaryCheck pronunciation: tailcoat oxfordlearnersdictionaries.com