deteriorate

de|terio|rate /dɪt'ɪəriəreɪt/ (deteriorates deteriorating deteriorated)
[VERB] V
If something deteriorates, it becomes worse in some way.
There are fears that the situation might deteriorate into full-scale war...
improve
deterioration [N-UNCOUNT]
...concern about the rapid deterioration in relations between the two countries.
improvement

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