Daily Chinese Idiom Guessing Game
To leave one's hometown and family, often due to hardship or necessity.
背离开；井古制八家为井，引伸为乡里，家宅。离开家乡到外地。
元·贾仲名《对玉梳》第一折送的他离乡背井，进退无门。
After the war, many families had to 背井离乡 and start anew in distant cities.