crack up

英 [kræk ʌp]

美 [kræk ʌp]

（因精神压力大而）垮掉，崩溃; （使）大笑

柯林斯词典

PHRASAL VERB (因精神压力大而)垮掉，崩溃
If someonecracks up, they are under such a lot of emotional strain that they become mentally ill.
1. She would have cracked up if she hadn't allowed herself some fun.
  她若是没给自己找点乐趣的话，早就崩溃了。
PHRASAL VERB (使)大笑
If youcrack upor if someone or somethingcracksyouup, you laugh a lot.
1. She told stories that cracked me up and I swore to write them down so you could enjoy them too...
  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。
2. We all just cracked up laughing.
  我们都不禁哈哈大笑起来。

verb

She would have cracked up if she hadn't allowed herself some fun.
她若是没给自己找点乐趣的话，早就崩溃了。
Expression for fatigue crack life is set up which takes energy of plastic deformation for crack propagation as the damage variable.
建立以裂纹扩展塑性变形能为损伤变量的疲劳裂纹寿命表达式。
If John goes on working and worrying as he has been doing he's bound to crack up sooner or later.
如果约翰照这样继续工作和忧虑下去，他的健康迟早一定会崩溃。
The comedian made his audience crack up with laughter.
喜剧演员令他的观众笑得要命。
Pressure of work caused John to crack up.
工作压力使约翰身体垮了。
The manganese sulfide inclusions to a different degree make the resistance curves of crack propagation move up or down, but there is not obvious influence on the slops of resistance curves of crack growth.
不同程度的硫化锰夹杂使得裂纹扩展阻力曲线上下移动，而对阻力曲线的斜率无明显影响；
Little kids just crack me up with the things they say.
小孩子们说的话真的让我捧腹不已。
But there was this perfect crack all the way up to the top.
那儿一条岩缝刚好一直延伸到山顶。
E.g.His jokes made her crack up.
他的笑话让她大笑不止。
Fortune even took a crack at coming up with 11 features the Apple TV must have.
《财富》杂志（Fortune）甚至尝试着列举了《苹果电视必备的11项功能》。