なりさがる

成り下がる
to be degraded
to come down in the world

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なりさがる【成り下がる】

degrade oneself to 《a lower position》; sink into 《poverty》; be reduced to 《beggary》; fall low; come down in the world.

●彼は人の物に手を出すまでに成り下がった. He has fallen so low as to take [steal] other people's belongings.