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English definition of “decay”

decay

verb [I or T]     /dɪˈkeɪ/
B2 to (cause something to) become gradually damaged, worse, or less: Sugar makes your teeth decay. The role of the extended family has been decaying for some time. Pollution has decayed the surface of the stonework on the front of the cathedral. the smell of decaying meatDecaying and staying freshDeteriorating and making worse
(Definition of decay verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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