rut
noun uk/rʌt/ us/rʌt/
(HOLE)
[ C ]（在松软地面上压出的）沟，凹痕;（尤指）车辙
a deep, narrow mark made in soft ground especially by a wheel
(SEXUALLY ACTIVE PERIOD)
[ S ]（尤指雄鹿、公羊等的）发情期
the period of the year during which particular male animals, especially deer and sheep, are sexually active
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 （雄性动物）发情
(of particular male animals) sexually excited
The bull elephant seal only puts on this display when in rut.
We spied two bull moose in rut, battling among the trees.
Avoid approaching deer during this season, as they can be aggressive when they are in rut.
Bucks tend to eat less when in rut.
The walruses exhibit a slightly different behaviour when in rut.
Idiom
(stuck) in a rutidiom C2 （工作、方法等）刻板乏味，墨守成规，一成不变
too fixed in one particular type of job, activity, method, etc., and needing to change
I need to change jobs - after 15 years here I feel I'm (stuck) in a rut. 我得换个工作了——在这儿呆了15年，我感觉刻板乏味极了。