在看到一樣特別讓自己心動的東西時，你可能會不顧一切地把它買下來，但是買完之后，又害怕自己買虧了，于是忍不住和其他商店的價格進行一番比對，這就是retro shopping（購物反芻）。

Retro shopping is to compare prices for an item after you've already purchased it.

“購物反芻”是在已經買下一件東西后又去比較價格的行為。

Example:

Carrie couldn't resist buying that Manolo Blahnik heels as soon as she saw it. After a little retro shopping, she was thrilled to realize she also got a great deal on it.

凱莉一眼看到那雙馬諾洛高跟鞋就忍不住把它買了下來。在進行了一番價格比對后，她驚喜地發現自己買得很值。

（中國日報網英語點津 陳丹妮）