crack up 哈哈大笑; 使…哈哈大笑。

crack有破裂、裂开的意思。人的笑就像是严肃的表情裂开了，所以crack up 也有哈哈大笑的意思。

 

If you crack up or if someone or something cracks you up, you laugh a lot

 

She told stories that cracked me up and I swore to write them down so you could enjoy them too.

她讲了些让我哈哈大笑的故事，我发誓要把那些故事写下来，以便你们也可以欣赏。

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