noun
the process of gradual deterioration or decomposition
verb
to undergo the process of decay; to decompose or deteriorate
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The process of decay in the old building was carefully studied by the preservation experts.
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The fruit started to decay after sitting out for too long.
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I can't believe how fast my teeth are decaying from all the soda I drink.
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The decay of trust between the two friends was evident in their strained conversations.