SLUG, noun [allied to slack, sluggard.]
1. A drone; a slow, heavy, lazy fellow.
2. A hinderance; obstruction.
3. A kind of snail, very destructive to plants, of the genus Limax. It is without a shell.
4. A cylindrical or oval piece of metal, used for the charge of a gun.
SLUG, verb intransitive To move slowly; to lie idle.
SLUG, verb transitive To make sluggish.