downgrade
down grayd
- n the property possessed by a slope or surface that descends
 - v rate lower; lower in value or esteem
 
- The book has been required reading for second-graders for two years, but recently Judith Bailey requested that the Laytonville Unified School District downgrade it to optional.
 - It did indeed downgrade all three a month later.
 - A rating downgrade of the monoline companies could be devastating for banks and others who bought insurance protection from them to cover their corporate bond exposure.