word meaning of 回也其庶乎 in Classical Chinese
This comes from Confucius's 论语 (Analects).
For the sake of other readers, let's break down the entire sentence:

回 refers to Yanhui 颜回, a character in the Analects
也 is a final particle in classical Chinese, which here separates the topic from the comment
其 in classical Chinese means &quot;his/hers/its&quot; or simply &quot;it&quot; referring to something already mentioned before. Here it's likely to be the former.
庶 （shu4) stands for 庶几 &quot;almost&quot;, &quot;maybe&quot;, used in a similar way as 差不多 &quot;almost done&quot;
乎 in classical Chinese is (among others) a final particle used in a similar way to 呢 (and I would say also 嘛)

So putting it all together, it becomes close to:

Yanhui, his [something mentioned before] is almost done.

Source: Analects 11-19 commentary (in Chinese)