leave one's hometown 背井离乡

“背井离乡”，汉语成语，背指“离开（leave）”，井指“家乡（home village）”。多形容由于生活不下去，被迫离开家乡。可以翻译为“(be forced to) leave one's hometown，go away from home或leave one's native place”等。

例句：

成千上万的人因战争所迫而背井离乡。

Thousands of people have been displaced by the war.