gradate

动词 gradate:

1. arrange according to grades
2. pass imperceptibly from one degree, shade, or tone into another

gra.date

v.（动词）
gra.dat.ed,gra.dat.ing,gra.dates
v.intr.（不及物动词）
To pass imperceptibly from one degree, shade, or tone to another.
渐渐转化：从一个等级，色调或音调不知不觉地变化为另一个等级，色调或音调
v.tr.（及物动词）
To cause to pass imperceptibly from one degree, shade, or tone to another.
使逐渐变化：导致等级，色调或音调不知不觉地变化
To arrange in or according to grades.
按等级安排

来源：
Back-formation from gradation
源自 gradation的逆构词