Rue can refer to different things depending on the context. Here are some possible meanings:

1. Verb: To feel sorrow, regret, or repentance for something.
2. Herb: Rue (Ruta graveolens) is an evergreen plant with gland-studded foliage. It is a small perennial shrub in the family Rutaceae used as a culinary and medicinal herb. Rue has a bitter flavor and is not used widely, but it is a component of berbere, a characteristic spice mixture of Ethiopia and Eritrea, and is a traditional flavoring in certain Mediterranean countries. The plant has a long history of use in traditional and herbal medicine, particularly to stimulate menstruation and as an abortifacient. However, such preparations are unlikely to terminate a pregnancy; they also may induce vomiting, hemorrhages, and liver damage, which can be lethal in severe cases. In addition to rue being hepatotoxic in large doses, skin contact to the plant can cause severe phytophotodermatitis and burn-like blisters following sun exposure.
3. Cooking: A roux is a mixture of equal parts flour and fat, cooked together over low to medium heat, to create a uniform thickening agent for sauces, soups, and stews. Roux is a common ingredient in French cuisine, used in mother sauces like béchamel and velouté, but it is also used in dishes from around the world.

It is important to note that the pronunciation of "rue" can vary depending on the context.