1 PHRASAL VERB (因精神压力大而)垮掉，崩溃 If someone cracks up, they are under such a lot of emotional strain that they become mentally ill. (因精神压力大而)垮掉，崩溃 [informal]
2 PHRASAL VERB (使)大笑 If you crack up or if someone or something cracks you up, you laugh a lot. (使)大笑 [informal]
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She told stories that cracked me up and I swore to write them down so you could enjoy them too. [VERB noun PREP.]
她讲了几个令我捧腹大笑的故事，我一定要写下来，好让你也乐乐。
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We all just cracked up laughing. [VERB PREP.]
我们都不禁哈哈大笑起来。
SYN burst out laughing, laugh, fall about (laughing), guffaw
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