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To diminish or impair in quality, character, or value: Time and neglect had deteriorated the property.
(verb-transitive)
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To grow worse; degenerate: The weather deteriorated overnight. His health had deteriorated while he was in prison.
(verb-intransitive)
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To weaken or disintegrate; decay: The nation's highways are deteriorating at a rapid pace.
(verb-intransitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.