To rue something is to wish, often quite deeply, that you had not done it. She rued the day she signed that contract means she looks back and feels the sting of that choice. Rue the day is the set phrase you will meet again and again.

To rue something後悔一件事 is to wish就是希望，often quite deeply深深地，that you had not done it你當初沒做那件事。She rued the day she signed that contract她後悔簽下那份合約的那一天 means意思是 she looks back她回頭看 and feels the sting of that choice還是能感受到那個選擇的刺痛。Rue the day「Rue the day」 is the set phrase是個固定用法 you will meet again and again你會一再碰到。

The word is old. You will find it in stories and in slightly formal talk; you will not often hear a teenager say I rue that.

The word這個字 is old是個古老的字。You你 will find it會在 in stories and in slightly formal talk故事和稍微正式的談話裡看到它；you你 will not often hear不常會聽到 a teenager say一個青少年說 I rue that我rue那件事。

There is also a noun: rue can mean the feeling itself, sorrow and regret, though that use is even more old-fashioned. In ordinary speech most people just say regret or wish I hadn't.

There is also有 a noun名詞用法：rue可以 can mean意指 the feeling itself那種感覺本身，sorrow and regret悲傷和懊悔，though that use不過這個用法 is even more old-fashioned更老派。In ordinary speech在一般口語裡 most people大多數人 just say只會說 regret或 or wish I hadn't「真希望我沒做」。

Though actually, English has another rue — a small bitter herb — and that plant name is a different word with a different history. This entry is the wishing you hadn't.

Though actually不過其實，English英文 has另有 another rue另一個rue——a small bitter herb一種帶苦味的小草藥——and that plant name而那個植物的名字 is a different word是另一個不同的字 with a different history有不同的來源。This entry這個詞條 is the wishing you hadn't講的是「真希望自己沒做過」這件事。