[ S ] the period of the year during which particular male animals, especially deer and sheep, are sexually active(尤指雄鹿、公羊等的)发情期
During the rut, stags can be seen fighting for females.在发情期,可以看到雄鹿为了争夺雌鹿而争斗。
in rut (of particular male animals) sexually excited(雄性动物)发情