idiom · to pour the purest cream (ghee) on the head, representing the transmission of supreme Buddhist wisdom

醍醐灌顶原指佛教中以极品酥油灌头的仪式，象征智慧的传递。

idiom · to enlighten someone with profound wisdom or provide a sudden, refreshing sense of clarity

听了教授的一番话，我感到醍醐灌顶，茅塞顿开。