rut (

     n 1: a groove or furrow (especially one in soft earth caused by
     2: a settled and monotonous routine that is hard to escape;
        "they fell into a conversational rut" [syn: groove]
     3: applies to nonhuman mammals: a state or period of heightened
        sexual arousal and activity [syn: estrus, oestrus, heat]
        [ant: anestrus]
     v 1: be in a state of sexual excitement; of male mammals
     2: hollow out in the form of a furrow or groove; "furrow soil"
        [syn: furrow, groove]