deteriorate deteriorate /dɪˈtɪriːɝˌeɪt/

verb

1. () Become worse or disintegrate  ( deteriorate )
   become worse or disintegrate
    His mind deteriorated
   His mind deteriorated
   
2. () Grow worse  ( degenerate , devolve , drop , deteriorate )
   grow worse
    Her condition deteriorated
   Her condition deteriorated
    Conditions in the slums degenerated
   Conditions in the slums degenerated
    The discussion devolved into a shouting match
   The discussion devolved into a shouting match