Read the dictionary definition of rut. All definitions for this word.
1. a settled and monotonous routine that is hard to escape
1. they fell into a conversational rut
2. a groove or furrow (especially one in soft earth caused by wheels)
3. applies to nonhuman mammals: a state or period of heightened sexual arousal and activity
4. hollow out in the form of a furrow or groove
1. furrow soil
5. be in a state of sexual excitement; of male mammals