decapitalize

verb3

1. •
   To uncapitalize (convert the first letter (or more) of (something) from uppercase to lowercase).
2. •
   To remove (something's) status as a capital crime; to cause (something) to no longer be a capital crime.

   • In 1801 Connecticut decapitalized arson, but only where no victim's life had been placed in danger. — 2009
3. •
   To convert a capital value, typically into a rental.