Definition of "Rue" :

noun: (French) a street or road in France

noun: sadness associated with some wrong done or some disappointment

"To his rue, the error cost him the game."

noun: leaves sometimes used for flavoring fruit or claret cup but should be used with great caution: can cause irritation like poison ivy

noun: European strong-scented perennial herb with grey-green bitter-tasting leaves; an irritant similar to poison ivy

verb: feel remorse for; feel sorry for; be contrite about