exult
verb [ I ] formal uk/ɪɡˈzʌlt/ us/ɪɡˈzʌlt/
（尤指因别人失败而）欢欣鼓舞，兴高采烈，喜形于色
to express great pleasure or happiness, especially at someone else's defeat or failure
They exulted at/over their victory. 他们获得了成功，喜形于色。
She seems to exult in her power. 她大权在握，一副洋洋得意的样子。