used to show that however powerful one is in the environment with which he is familiar, he is at a disadvantage when he leaves there; literally: a local caterpillar outshines a fierce tiger
Cantonese
猛虎不及地头虫
猛虎不及地頭蟲
used to show that however powerful one is in the environment with which he is familiar, he is at a disadvantage when he leaves there; literally: a local caterpillar outshines a fierce tiger