grade on a curve

verb2

1. •
   To use a grading system based on the scale of performance of a group to normalize a right-skewed grade distribution (with more lower scores) into a bell curve, so that more can receive higher grades, regardless of their actual knowledge of the subject; to curve a grade.

   • He asked the teacher to grade (the test) on a curve.
2. •
   To compare the members of a set or group by using a relative scale, based on performance relative to other members.