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deteriorate [deteriorated, deteriorating, deteriorates]▼(grow worse)verb[UK: dɪ.ˈtɪə.rɪə.reɪt] [US: də.ˈtɪ.riə.ˌret]
take a turn for the worse▼(start to become worse)verb
worsen [worsened, worsening, worsens]▼(intransitive: get worse)verb[UK: ˈwɜː.sən] [US: ˈwɝː.sən]
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