1. (n.)slug any of various snaillike terrestrial gastropod mollusks having no shell or only a rudimentary one, feeding on plants, and often a pest of leafy garden crops.
2. slug a metal disk used as a coin or token, generally counterfeit.
3. slug a piece of lead or other metal for firing from a gun.
21. slug to fight, esp. with fists: slugged it out.
22. (v.i.)slug to hit or be capable of hitting hard.
23. (n.)slug a hard blow or hit, esp. with a fist or baseball bat.
Etymology: (1820–30; perh. identical with slug1)
Definition of 'Slug'
Princeton's WordNet
1. (noun)bullet, slug a projectile that is fired from a gun
2. (noun)slug a unit of mass equal to the mass that accelerates at 1 foot/sec/sec when acted upon by a force of 1 pound; approximately 14.5939 kilograms
5. (noun)slug an amount of an alcoholicdrink (usually liquor) that is poured or gulped "he took a slug of hard liquor"
6. (noun)type slug, slug a strip of type metal used for spacing
7. (noun)slug any of various terrestrial gastropods having an elongated slimy body and no external shell
8. (verb)punch, clout, poke, lick, biff, slug (boxing) a blow with the fist "I gave him a clout on his nose"
9. (verb)slug, slog, swig strike heavily, especially with the fist or a bat "He slugged me so hard that I passed out"
10. (verb)idle, laze, slug, stagnate be idle; exist in a changeless situation "The old man sat and stagnated on his porch"; "He slugged in bed all morning"
3. (noun)Slug any one of numerous species of terrestrial pulmonate mollusks belonging to Limax and several related genera, in which the shell is either small and concealed in the mantle, or altogether wanting. They are closely allied to the land snails
12. (verb)Slug to become reduced in diameter, or changed in shape, by passing from a larger to a smaller part of the bore of the barrel; -- said of a bullet when fired from a gun, pistol, or other firearm