expatiate
verb [ I ] formal disapproving uk/ekˈspeɪ.ʃi.eɪt/ us/ekˈspeɪ.ʃi.eɪt/
长篇大论；赘述；详述
to speak or write about something in great detail or for a long time
She expatiated on/upon her work for the duration of the meal. 饭桌上她一直在滔滔不绝地谈她的工作。
Synonyms: elaborate expound