>Why can we use the を particle with 休む in Japanese if it is an intransitive verb? 

I think the most simple way of understanding is that 休む is a transitive and intransitive verb.

In Japanese there are many verbs which is transitive and intransitive, for example, ひく、よろこぶ

馬をひく(transitive)

潮がひく(intransitive)

よろこぶ：　あの人がよろこんでいる(intransitive)

よろこぶ： 父は弟の合格をよろこんでいる(transitive?)。

I personally think the line between transitive and intransitive in Japanese is not a defined conception but only a practical model/guideline to make things easier to understand.

The dictionary I refered to says that "よろこぶ" is 自動詞 and at the same time it provides an example sentence 父は弟の合格をよろこんでいる。

Transitive/Intransitive is a conception of the grammar of Indo-European languages. Thinking too much about it won't get me anywhere when I think about Japanese language. I use it if it works, I don't if not.

She is a Japanese teacher by profession who teaches it here at the hourly rate of USD 39.00 at least. If she were not such, I would not take the trouble to make any comments even on her wrong or insufficient corrections or comments. She should know much better as a teacher than others do lest she should do more harm than good. Along with privilege comes responsibility.

Ueda-san, are you having fun?

You write your brilliant answer and that's enough. Criticizing other people's answer won't get you anywhere.

(理屈はどうあれ、思いやりに欠けている）

William＞

I suggest you use "question" forum for asking questions.

<a href="https://www.italki.com/questions/japanese" rel="noopener noreferrer" target="_blank">https://www.italki.com/questions/japanese</a>;

Almost all intransitive verbs take が (e.g. ドアが開く、電気が消える)

....but there are some exceptions - intransitive verbs that don't take が. And 休む is one of those (仕事を休む、会社を休む)

入る is another example of an intransitive verb that doesn't take が (it takes に): お風呂に入る

【His question】

Why can we use the を particle with 休む in Japanese if it is an intransitive verb?

such as

仕事を休む to take off time from work

Almost all intransitive verbs take が (e.g. ドアが開く、電気が消える)

....but there are some exceptions - intransitive verbs that don't take が. And 休む is one of those (仕事を休む、会社を休む)

入る is another example of an intransitive verb that doesn't take が (it takes に): お風呂に入る