(idiomatic) To sense something suspicious.

(idiomatic, colloquial, US) An old, unattractive automobile, purchased for little money, to be driven during brutal Great Lakes winters while the owner's "good" car remains garaged and protected from corrosive road salt for the season.

(Britain, colloquial, mildly vulgar) Extremely drunk.

A New World rat of the genus Oryzomys, having an exceptionally long tail.

(colloquial) A person who spends an unusually large amount of time at a gym.

(US) Any of various aquatic or semi-aquatic rodents from Florida and southern Georgia, especially Neofiber alleni; the muskrat. / (Australia) A water mouse, especially, the rakali, Hydromys chrysogaster.

(literally) A rat that lives on or along a river. / (chiefly derogatory) A lower-class person living on or along a river.

(informal) A soldier trained to enter enclosed enemy spaces like tunnel systems to search them and eliminate and/or capture any occupants.

A gerbil (subfamily Gerbillinae) of the deserts of Africa and Asia / A kangaroo rat (genus Dipodomys) from North America / A Natal multimammate mouse (Mastomys natalensis) from Africa

(slang) person who lives and exhibits attitudes of inner city life. usually a negative connotation that implies poor upbringing, bad manners, little to no education and low class behavior