By midnight the hilarity had increased.是什么意思？

By midnight the hilarity had increased.

天已经到了午夜时分,人们的狂欢劲仍然有增无减.

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

midnight

n. 子夜，午夜，漆黑，一段黑暗阴暗的时间，漏夜；

例句
All through yesterday crowds have been arriving and by midnight thousands of people packed the square.
昨天陆续有大批人到来，午夜时有几千人聚集在广场上。

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

hilarity

n. 欢闹，狂欢；

例句
The announcement was greeted with much hilarity and mirth.
这一项宣布引起了热烈的欢呼声.

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

increased

adj. 增加的，增强的；v. 增加，增大，增多( increase的过去式和过去分词 )，增强，增进，[缝纫]放（针），增强；

例句
Warren also allows that capitalist development may, in its early stages, result in increased social inequality.
沃伦也承认资本主义发展初级阶段可能会导致社会不平等现象加剧。