在看到一样特别让自己心动的东西时，你可能会不顾一切地把它买下来，但是买完之后，又害怕自己买亏了，于是忍不住和其他商店的价格进行一番比对，这就是retro shopping（购物反刍）。

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

“购物反刍”是在已经买下一件东西后又去比较价格的行为。

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.

凯莉一眼看到那双马诺洛高跟鞋就忍不住把它买了下来。在进行了一番价格比对后，她惊喜地发现自己买得很值。

（中国日报网英语点津 陈丹妮）