A decline in quality or condition; the process of becoming worse instead of better.
From disimprove + -ment (noun suffix). Created by adding the -ment suffix to the verb disimprove, following the standard English pattern of converting verbs to abstract nouns that describe the action or its result.
This word is a linguistic time capsule—by the 1700s, 'improvement' had become so fashionable (especially with colonialism and industrial progress) that people literally needed a word for when things went backward. Disimprovement expressed anxiety about the opposite of 'progress,' a deeply important concept to Enlightenment thinkers.
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