Definition of "rue"
Any of various perennial shrubs of the genus Ruta, especially the herb Ruta graveolens, formerly used in medicines.
To cause to repent of sin or regret some past action.
To cause to feel sorrow or pity.
To repent of or regret (some past action or event); to wish that a past action or event had not taken place.
To feel compassion or pity.