downgrade

nouns

the property possessed by a slope or surface that descends
downgrade
is a type of (narrower)
the gradient of a slope or road or other surface
"the road had a steep grade"
grade

verbs

rate lower; lower in value or esteem
downgrade
antonym
upgrade
is a type of (narrower)
assign a rank or rating to
"how would you rank these students?"; "The restaurant is rated highly in the food guide"
grade, order, place, range, rank, rate