这个词我们很熟悉吧，表示“购买”。但该词还能表示“相信（某种说法）”的意思，比如：

①He said he couldn't attend my party because he had to prepare for an exam, but I don't buy it.

她说参加不了我的聚会因为她要准备一门考试。我才不信。

②I don't buy his story.

我信他个鬼。

*上述两个buy都表示“相信”