1PHRASAL VERB (因精神壓力大而)垮掉,崩潰 If someone cracks up, they are under such a lot of emotional strain that they become mentally ill. (因精神壓力大而)垮掉,崩潰 [informal]
She would have cracked up if she hadn't allowed herself some fun. [VERBPREP.]
她若是沒給自己找點樂趣的話,早就崩潰了。
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.]
她講了幾個令我捧腹大笑的故事,我一定要寫下來,好讓你也樂樂。
We all just cracked up laughing. [VERBPREP.]
我們都不禁哈哈大笑起來。
SYN burst out laughing, laugh, fall about (laughing), guffaw