rebate
v.
late 14c., "to reduce;" early 15c., "to deduct, subtract," from Old French rabattre "beat down, drive back," also "deduct," from re- "repeatedly" (see re-) + abattre "beat down" (see abate). Meaning "to pay back (a sum) as a rebate" is from 1957. Related: Rebated; rebating.
n.
1650s, from rebate, v..
〔李〕[re-;bat;-e] v.打折扣； 使变钝 ←bat,batt (L battere)=to beat 打击