noun

• (zoology) Sexual desire in any of many mammals, often specific to mating season.
• (fandom slang, countable, uncountable) In omegaverse fiction, the intense biological urge of an alpha to mate, typically triggered by proximity to an omega in heat.
  "Proximity to an omega in heat can sometimes cause alphas go into rut, an aggressive need for sexual intercourse usually triggered by the scent of an omega in heat."

verb

• (intransitive) To be in the annual rut or mating season.
• (intransitive) To have sexual intercourse.
• (transitive, rare) To have sexual intercourse with.
  "“Alfred,” Ragnar continued scathingly. “All he cares about is rutting girls, which is good![…]”"
• (slang, intransitive) To rub the genitals against something for physical stimulation.
  "Near-synonym: hump"

noun

• (figurative) A fixed routine, procedure, line of conduct, thought or feeling.
• (figurative) A dull routine.
  "Dull job, no interests, no dates. He's really in a rut."

verb

• (transitive) To make a furrow.