not since是什么意思

问题描述

Well, sir, you'll be covered with cobwebs if you go into it. Why, it hasn't been opened for nearly five years, not since his lordship died.

请问：not since 是什么意思？

老师答疑

谭老师：

翻译：好吧先生，您要是进去的话会全身盖满蜘蛛网的。欸，它已经有近五年没打开过了，打老爷去世后就没开过。

这里的 not since his lordship died 是对前一句进行补充说明，not 其实是对前一句相似部分的省略。

补全省略的部分之后，其义自现：it hasn't been opened since his lordship died。