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discount; reduction; rebate
tenths discounted; tenths reduced
学生証を見せると割り引きが受けられる。
You can get a discount by showing your student ID.
セール期間中は全品二割の割り引きになる。
During the sale period, all items are discounted by twenty percent.
まとめて買うと割り引きしてもらえた。
I got a discount for buying in bulk.