RUT
WordNet
noun
(1) A settled and monotonous routine that is hard to escape
"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
verb
(4) Hollow out in the form of a furrow or groove
"Furrow soil"
(5) Be in a state of sexual excitement; of male mammals
WiktionaryText
Etymology 1
Old French ‘noise, roar, bellowing’, from Latin rugitus, from rugire ‘to roar’
Noun
- Sexual desire or oestrus of cattle, and various other mammals.