a slimy elongated invertebrate animal with no shell that is related to the snail and is found in most damp parts of the world: family Limacidae [Middle English slugge sluggard, of Scandinavian origin]
a quantity of alcoholic drink, esp spirits, swallowed at a single gulpa lump, disc, or cylinder of metal, plastic, or other material, e.g.:a bulletNAmer a disc for insertion in a slot machinein printing, a line of type cast as one piecea strip of metal used for spacing that is thicker than a leada unit of mass that will acquire an acceleration of one foot per second per second when acted on by a force of one pound; about 14.6kg (32.174lb) [prob from slug1]
chiefly NAmer, informal to hit (somebody or something) hard, esp with the fist or a batslug it out to compete fiercely for successslugger noun[prob variant of slog1]