HSK 5
退还
tuìhuán动
to return (sth borrowed etc); to send back; to refund; to rebate
商家已经退还了全部费用。
Shāng jiā yǐ jīng tuì huán le quán bù fèi yong.
The merchant has refunded the full fee.
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New in the HSK 3.0 word list at level 5.