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