To return a deposit in English, you would say "to refund a deposit." This phrase comes from the verb "to refund," which means to give money back, often as a result of a purchase or fee that was paid previously.

Here are some example sentences using this phrase:

I'd like to refund my security deposit now that I'm moving out of my apartment.

The airline will automatically refund your deposit if your flight is cancelled.

Can you tell me the process for refunding my deposit on this rental car?

In Chinese, you could say "退还押金" to express the same idea. Here are some example sentences using this phrase:

我想在搬出公寓时退还我的押金。

如果航班取消，航空公司会自动退还您的押金。

能告诉我退还租车押金的流程吗？