暢ㄔㄤˋchàng所ㄙㄨㄛˇsuǒ欲ㄩˋyù言ㄧㄢˊyán

痛痛快快、毫無顧忌的把心裡的話全部講出來。清·方苞〈遊豐臺記〉：「暢所欲言，舉酒相屬，向夕猶不能歸。」似各抒己見、知無不言、言無不盡反噤若寒蟬、守口如瓶

英lit. fluently saying all one wants (idiom); to preach freely on one's favorite topic, to hold forth to one's heart's content

法dire ce qu'on a à dire, vider son sac