A long, deep track made by the repeated passage of the wheels of vehicles. The heavy trucks left deep ruts in the muddy road.
A habit or pattern of behavior that has become dull and unproductive but is hard to change. He felt stuck in a rut at his job, doing the same tasks every day without any challenge.
The period of the year during which certain male animals, especially deer, are sexually active and engage in mating behaviors. During the rut, the stags were more aggressive and competed fiercely for mates.