沦为

沦为	lún wéi	to sink down to / to be reduced to (sth inferior)
沦	lún	to sink (into ruin, oblivion) / to be reduced to
为	wéi	as (in the capacity of) / to take sth as / to act as / to serve as / to behave as / to become / to be / to do / by (in the passive voice)
为	wèi	because of / for / to
为	wéi	variant of 为
为	wèi	variant of 为