沦落街头lún luò jiē tóu

be driven onto the streets(to become a tramp,beggar or prostitute); be reduced to beggary (/vagrancy,etc)
❍ 在那种年月，人们过着朝不保夕的生活。我的朋友中最后～的不乏其人。In those years,people led a precarious life. Quite a number of my friends were eventually reduced to beggary.

沦落街头lun luo jie tou

be driven into the street—become a tramp or beggar