rut

Noun

• applies to nonhuman mammals: a state or period of heightened sexual arousal and activity

• a settled and monotonous routine that is hard to escape
  • they fell into a conversational rut
    

• a groove or furrow (especially one in soft earth caused by wheels)

Verb

• hollow out in the form of a furrow or groove
  • furrow soil
    

• be in a state of sexual excitement; of male mammals

Related words

• Synonyms: 
  estrus , oestrus , heat , groove , furrow
• Antonyms: 
  anestrus , anestrum , anoestrus , anoestrum