mid-15c., past participle adjective from crack (v). Meaning "mentally unsound" is 17c. (compare crack-brain "crazy fellow"). The equivalent Greek word was used in this sense by Aristophanes.
实用例句
1. He cracked jokes and talked about beer and girls.
他爱说笑话，喜欢谈论啤酒和姑娘。来自柯林斯例句
2. The government has cracked down hard on those campaigning for greater democracy.
政府严厉镇压了那些发起运动争取更广泛民主的人士。来自柯林斯例句
3. 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。来自柯林斯例句
4. When he spoke, his voice was hoarse and cracked.
他说话时声音沙哑颤抖。来自柯林斯例句
5. Package holidays are not always all they're cracked up to be.
