stepsthdown
—phrasal verbwithstepverb[I+ adv/prep]uk/step/us/step/-pp-
toreducetheamount,supply, orrateof something
减少，降低（数量、供应量或速率）
Thedoctorhas said that I canstartsteppingdown mymedicationin a fewdays'time.医生说我几天后可以开始减少用药量。
Thisdeviceis used forsteppingdown thevoltage.这个装置用于降低电压。