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.
4. slug any heavy piece of crude metal.
5. slug Print.
6. slug a thick strip of type metal less than type-high.
7. slug such a strip containing a type-high number or other character for temporary use.
8. slug a line of type in one piece, as produced by a Linotype.
9. slug a shot of liquor taken neat; belt.
10. slug Slang. a person who is lazy or slow-moving; sluggard.
11. slug Journalism.
12. slug a short phrase or title used to indicate the story content of a piece of copy.
13. slug the line of type carrying this information.
14. slug a gold coin of California, issued in 1849 and worth 50 dollars.
15. slug a unit of mass, of about 32.2 lb (15 kg), that is accelerated 1 ft per sec per sec by a force of 1 lb.
16. (v.t.)slug Print.
17. slug to make (corrections) by replacing entire lines of type, esp. as set by a Linotype.
18. slug Journalism. to furnish (copy) with a slug.
19. (v.t.)slug to strike hard, esp. with the fist.
20. slug to drive (a baseball) a great distance.
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 alcoholic drink (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
6. (noun)slug an irregularly shaped piece of metal, used as a missile for a gun
7. (noun)slug a thick strip of metal less than type high, and as long as the width of a column or a page, -- used in spacing out pages and to separate display lines, etc
10. (verb)slug to load with a slug or slugs; as, to slug a gun
11. (verb)slug to strike heavily
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
Definitions of slug 
Afrikaans: slak
Arabic: بَزّاقَه: حَيوان من الرَّ
Bulgarian: плужек
Brazilian: lesma
Czech: slimák
German: die Wegschnecke
Danish: skovsnegl
Greek: γυμνοσάλιαγκας
Spanish: babosa
Estonian: nälkjas
Farsi: ليسه
Finnish: etana
French: limace
Hebrew: שַבּלוּל
Hindi: घोंघा, शम्बूक
Croatian: puž balavac
Hungarian: meztelen csiga
Indonesian: pacat
Icelandic: brekkusnigill
Italian: limaccia, lumacone
Japanese: なめくじ
Korean: 민달팽이
Lithuanian: šliužas
Latvian: gliemis
Malay: lintah
Dutch: naakte slak
Norwegian: nakensnegl
Polish: ślimak nagi
Persian: ليسه
Pashto: پشوګۍ، ماماغواګۍ، كار ګه 
Portuguese: lesma
Romanian: limax, melc
Russian: слизняк
Slovak: slimák
Slovenian: polž
Serbian: puž golać
Swedish: snigel
Thai: ทากจำพวก Stylommatophora 
Turkish: kabuksuz sümüklü böcek
Taiwanese: 蛞蝓
Ukrainian: слимак
Urdu: بے سیپ کا صدفہ یا رخوہ
Vietnamese: con sên
Chinese: 蛞蝓
