An "
upgrade" to a product or service, which, while intended to be an enhancement or improvement, actually renders that product or service less useful or valuable than it previously was.
The word can be used as a
noun. Its
verb form is "to dehance". Its adjective form is "dehanced" (see below).
The most
common example of dehancements are in the
software industry. For example, the
2008 edition of Microsoft Word was dehanced. It is more difficult to navigate through screens and commands, and in general much less effective than earlier versions.