deteriorate /dɪˈtɪriəˌreɪt/ verb
1 [no object] : to become worse as time passes
- The weather gradually deteriorated as the day went on.
- Her health continues to deteriorate.
- efforts to save a deteriorating rain forest
- The disagreement deteriorated into a fight.
2 [+ object] : to make something worse
- Exposure to rain and sun will gradually deteriorate the paint.
— deteriorated adjective
- a deteriorated building
- a badly deteriorated part of the city