rut

Short definition from Wiktionary

Noun

1. 1
   Sexual desire in any of many mammals, often specific to mating season.
2. 2
   The noise made by deer during sexual excitement.
3. 3
   Roaring, as of waves breaking upon the shore; rote.
4. 4
   In omegaverse fiction, the intense biological urge of an alpha to mate, typically triggered by proximity to an omega in heat.
5. 5
   A furrow, groove, or track worn in the ground, as from the passage of many wheels along a road.
6. 6
   A fixed routine, procedure, line of conduct, thought or feeling.
7. 7
   A dull routine.

Verb

1. 1
   To be in the annual rut or mating season.
2. 2
   To have sexual intercourse.
3. 3
   To have sexual intercourse with.
4. 4
   To rub the genitals against something for physical stimulation.
5. 5
   To make a furrow.