Definition of deteriorate verb from the Oxford Advanced Learner's Dictionary

 

deteriorate

 verb
verb
BrE BrE//ˈtɪəriəreɪt//
 
; NAmE NAmE//ˈtɪriəreɪt//
 
[intransitive]Verb Forms present simple I / you / we / they deteriorate
BrE BrE//ˈtɪəriəreɪt//
 
; NAmE NAmE//ˈtɪriəreɪt//
 
he / she / it deteriorates
BrE BrE//dɪˈtɪəriəreɪts//
 
; NAmE NAmE//dɪˈtɪriəreɪts//
 
past simple deteriorated
BrE BrE//dɪˈtɪəriəreɪtɪd//
 
; NAmE NAmE//dɪˈtɪriəreɪtɪd//
 
past participle deteriorated
BrE BrE//dɪˈtɪəriəreɪtɪd//
 
; NAmE NAmE//dɪˈtɪriəreɪtɪd//
 
-ing form deteriorating
BrE BrE//dɪˈtɪəriəreɪtɪŋ//
 
; NAmE NAmE//dɪˈtɪriəreɪtɪŋ//
 
 
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to become worse Her health deteriorated rapidly, and she died shortly afterwards. deteriorating weather conditions deteriorate into something The discussion quickly deteriorated into an angry argument. Word Origin late 16th cent. (in the sense ‘make worse’): from late Latin deteriorat- ‘worsened’, from the verb deteriorare, from Latin deterior ‘worse’.Extra examples Relations between the two countries have deteriorated further this week. The situation is likely to deteriorate unless something is done now. The unrest rapidly deteriorated into civil war. Her health deteriorated rapidly and she died shortly afterwards. The overall quality of rivers and canals has deteriorated. They had to cope with deteriorating weather conditions. somebody’s health/​a situation/​conditions/​the weather/​a relationship worsens/​deteriorates
See the Oxford Advanced American Dictionary entry: deteriorate