名詞 rue:

1. European strong-scented perennial herb with grey-green bitter-tasting leaves; an irritant similar to poison ivy
   同義詞：herb of grace, Ruta graveolens
2. leaves sometimes used for flavoring fruit or claret cup but should be used with great caution: can cause irritation like poison ivy
3. sadness associated with some wrong done or some disappointment
   同義詞：sorrow, regret, ruefulness
4. (French) a street or road in France

動詞 rue:

1. feel remorse for; feel sorry for; be contrite about
   同義詞：repent, regret

1. I rue never having been to university.
   我后悔從未上過大學(xué)。
2. He'll rue the day he married her.
   他將會因?yàn)楹退Y(jié)婚而抱恨終身。

rue

v.（動詞）
rued,ru.ing,rues
v.tr.（及物動詞）
To feel regret, remorse, or sorrow for.
對…感到懊悔、后悔或悔恨
v.intr.（不及物動詞）
To feel regret, remorse, or sorrow.
感到懊悔、后悔或悔恨
n.（名詞）
Sorrow; regret:
后悔，悔恨：
例句：
.To their rue, the Social Democrats have to acknowledge that the Conservative-Liberal coalition has captured the center where elections are won.(Elizabeth Pond)
.讓他們悔恨的是，社會民主黨人不得不承認(rèn)保守黨和自由黨聯(lián)盟已抓住了競選成功的關(guān)鍵.(伊麗莎白·龐德)

來源：
Middle English ruen
中古英語 ruen
from Old English hrôowan [to affect with grief]
源自 古英語 hrôowan [假裝傷心]
hrôowian [to repent]
hrôowian [后悔]

【引伸】
ru.er
n.（名詞）

---------------另--------------
rue
rue 2

n.（名詞）
Any of various aromatic southwest Asian or Mediterranean plants of the genusRuta, especially the ornamental R. graveolens, having bipinnately compound leaves that yield an acrid, volatile oil formerly used in medicine.
蕓香：一種生長于亞洲西南部或地中海沿岸的蕓香屬 植物，尤指裝飾用的 臭蕓香, 具有羽狀復(fù)葉，能生產(chǎn)一種舊時作藥用的刺激性的揮發(fā)油

來源：
Middle English
中古英語
from Old French
源自 古法語
from Latin rôta
源自 拉丁語 rôta
probably from Greek rhutô
可能源自 希臘語 rhutô