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.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI