disimprove

1. (transitive, rare) To make worse.Examples: "To which may be added this advantage, that the services of churchmen are rewardable upon the church's stock: no need to disimprove the royal banks to pay thanks to bishops."raretransitive

2. (intransitive, rare) To deteriorate.intransitiverare

3. (informal, rare, influenced by the German verb verschlimmbessern) To try to make something better but end up making it worse.informalrare