rut (Noun) — A groove or furrow (especially one in soft earth caused by wheels).
rut (Noun) — A settled and monotonous routine that is hard to escape. ex. "they fell into a conversational rut"
rut (Noun) — Applies to nonhuman mammals: a state or period of heightened sexual arousal and activity.
rut (Verb) — Be in a state of sexual excitement; of male mammals.
rut (Verb) — Hollow out in the form of a furrow or groove. ex. "rut soil"