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