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The Collaborative International Dictionary
Disimprove

Disimprove \Dis`im*prove"\, v. t. To make worse; -- the opposite of improve. [R.]
--Jer. Taylor.

Disimprove

Disimprove \Dis`im*prove"\, v. i. To grow worse; to deteriorate.

Wiktionary
disimprove

vb. 1 (context transitive rare English) to make worse 2 (context intransitive rare English) to deteriorate

Usage examples of "disimprove".

But if he had, Bond would have drawn the nine and disimproved down to a four.

I don mind trying to improve a robot, but deliberately disimproving him is not something I care to do.

We've done something of a similar nature, you know, when we located bacteria from wounds and learned how to disimprove their symbiotic bacteriophages so that they would kill their hosts.

We’ve done something of a similar nature, you know, when we located bacteria from wounds and learned how to disimprove their symbiotic bacteriophages so that they would kill their hosts.

But if these mechanicals could be contaminated, infected with our disimproved parasite, they would carry it with them to destroy all similar life-forms in the Oort Cloud itself, probably including the more intelligent ones, too.