悔不该 huǐbùgāi to regret having done something Origin Definitions Defs Strokes Stroke Words Sentences Sents 1 sentence 他们开始后悔不该买这么大的房子。 tāmen kāishǐ hòuhuǐ bùgāi mǎi zhème dà de fángzi. They began to regret the purchase of such a large house. Source: UM-Corpus: Education