dog
n. canine, carnivorous animal from the family Canidae (especially the domesticated variety commonly kept as pets, trained to hunt, pull sleds, etc.); despicable or cowardly person (Informal)
v. follow around, hound; fasten with a vise or similar tool (Machinery); harass, pester (Slang); defeat an opponent, win (Slang)
adj. of or pertaining to a dog; despicable, cowardly (Informal)