退还 tuìhuán to return (something borrowed etc)
to return (something borrowed etc); to send back; to refund; to rebate
How to remember 退还: 退 to retreat + 还 still = to return (something borrowed etc).
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How it is used
- To give back / refund something owed or paid - 退还押金 (tuìhuán yājīn) refund the deposit; 退还多收的钱 (tuìhuán duō shōu de qián) return the overcharge.
- Formal; combines 退 (return) + 还 (give back). Everyday 'give back' is 还 (huán); a purchase refund is often just 退货 (tuìhuò) / 退款 (tuìkuǎn).