1PHRASAL 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]
She would have cracked up if she hadn't allowed herself some fun. [VERBPREP.]
她若是没给自己找点乐趣的话,早就崩溃了。
2PHRASAL VERB (使)大笑 If you crack up or if someone or something cracks you up, you laugh a lot. (使)大笑 [informal]
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。
We all just cracked up laughing. [VERBPREP.]
我们都不禁哈哈大笑起来。
SYN burst out laughing, laugh, fall about (laughing), guffaw