Remove unused code or unused features.

删除不用的代码或者特性。

youdao

On the other hand, dead, unused code only clutters a program and makes it harder to read and understand, so delete it.

另一方面，无效的，废弃的代码只会使程序变得拥挤不堪，难于阅读和理解，所以还是删掉的好。

youdao

Lots of systems suffer from the extremes: clumped, lengthy code with little abstractions, or an overly designed system with unnecessary complexity and unused code.

很多系统的设计会走向极端：缺乏抽象的冗长的代码，或是充斥着复杂的从不使用的代码。

youdao