noun
A discount given as a special favor or in recognition of effort, often used in business or quotation contexts.
この見積書には出精値引きが含まれています。
This quotation includes a special discount.
長年の取引先には出精値引きを適用することがある。
We sometimes apply a special discount for long-standing clients.
値引き is a general price reduction or discount, while 出精値引き specifically implies a special discount given as a favor or in recognition of effort.
Compound of 出精 (shussei, 'effort; diligence') and 値引き (nebiki, 'discount'). The exact historical derivation is uncertain, but the term is conventionally used in business contexts for a special discount.