lemming

◊ Lemmings sometimes form large groups that move together. According to legend, these groups sometimes march into the sea, where large numbers of the lemmings drown. Because of this, people are sometimes said to be acting like lemmings when they do something that is harmful or stupid because other people are doing it.大量旅鼠有时形成庞大的群体集体行动。相传，大群的旅鼠有时会涌向大海，许多旅鼠被淹死。因此，“像旅鼠一样”有时用来比喻人们随大流去做有害或愚蠢的事。