The process of growing worse, or the state of having grown worse.(noun)
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Use "deterioration" in a sentence
"Moody's said it made the decision mostly because of what it called the deterioration of Dubai's broader economic outlook."
"SAHRC chairman Dr Barney Pityana on Friday expressed concern about what he described as the deterioration in the South African human rights environment under the Mbeki government."
"Pityana expressed concern about what he described as the deterioration in the South African human rights environment under the Mbeki government."