●lift/raise the ˈroof ( bring the ˈroof down) (informal) (of a large group of people一大群人) make a very loud noise, for example by shouting or singing闹翻天◆The audience raised the roof when the band played their favourite song.乐队奏响观众最喜欢的一首歌时，他们欢声雷动。◆The crowd brought the roof down when the home team scored. I had never ever heard such cheering.主队得分时，人群欢声震天。我还从没听过这么大的欢呼声。