(n): a long narrow furrow cut either by a natural process (such as erosion) or by a tool (as e.g. a groove in a phonograph record)
(n): a settled and monotonous routine that is hard to escape
(n): an unvarying or habitual method or procedure
(n): applies to nonhuman mammals: a state or period of heightened sexual arousal and activity
(n): the condition or state of the body or bodily functions
(v): be in a state of sexual excitement; of male mammals
(v): have the quality of being; (copula, used with an adjective or a predicate noun)
(v): hollow out in the form of a furrow or groove
(v): turn up, loosen, or remove earth