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deteriorate

verb [I]
 
 
/dɪˈtɪə.ri.ə.reɪt/ US  /-ˈtɪr.i-/

Definition

C1 to become worse: She was taken into hospital last week when her condition suddenly deteriorated. The political situation in the region has deteriorated rapidly.Deteriorating and making worse deterioration
 
 
/dɪˌtɪə.ri.əˈreɪ.ʃən/ US  /-ˌtɪr.i-/ noun [C or U]
We've seen a deterioration in relations between the countries.Deteriorating and making worse
(Definition of deteriorate verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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