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
[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