slug

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A round bullet larger than buckshot.
2. n. Informal A shot of liquor.
3. n. Informal An amount of liquid, especially liquor, that is swallowed in one gulp; a swig.
4. n. A small metal disk for use in a vending or gambling machine, especially one used illegally.
5. n. A lump of metal or glass prepared for further processing.
6. n. Printing A strip of type metal, less than type-high and thicker than a lead, used for spacing.
7. n. Printing A line of cast type in a single strip of metal.
8. n. Printing A compositor's type line of identifying marks or instructions, inserted temporarily in copy.
9. n. Physics The unit of mass that is accelerated at the rate of one foot per second per second when acted on by a force of one pound weight.
10. v. Printing To add slugs to.
11. v. Informal To drink rapidly or in large gulps: slugged down a can of pop.
12. n. Any of various small, snaillike, chiefly terrestrial gastropod mollusks of the genus Limax and related genera, having a slow-moving elongated body with no shell or only a flat rudimentary shell on or under the skin.
13. n. The smooth soft larva of certain insects, such as the sawfly.
14. n. A slimy mass of aggregated amoeboid cells from which the sporophore of a cellular slime mold develops.
15. n. Informal A sluggard.
16. v. To strike heavily, especially with the fist or a bat.
17. n. A hard heavy blow, as with the fist or a baseball bat.
18. v. To wait for or obtain a ride to work by standing at a roadside hoping to be picked up by a driver who needs another passenger to use the HOV lanes of a highway.
19. n. A commuter who slugs.

Century Dictionary and Cyclopedia

1. To be slow, dull, or inert; be lazy; lie abed: said of persons or of things.
2. To make sluggish.
3. To hinder; retard.
4. Slow; sluggish.
5. n. A slow, heavy, lazy fellow; a sluggard; a slow-moving animal.
6. n. Hence Any slow-moving thing.
7. n. A hindrance; an obstruction.
8. n. A terrestrial pulmonate gastropod of one of the families Limacidæ and Arionidæ and related ones, which has only a rudimentary shell, if any. The species inhabit all the northern temperate regions of the globe, living on the land, and chiefly about decaying wood in forests, gardens, and damp places. Marine nudibranchiate gastropods are called sea-slugs. See sea-dug, and cut under Limacidæ.
9. n. Some or any slug-like soft-bodied insect or its larva; a grub: as, the yellow-spotted willow-slug, the larva of a saw-fly, Nematus ventralis. See pear-slug, rose-slug, slug-caterpillar, slug-worm.
10. n. The trepang or sea-cucumber; any edible holothurian; a sea-slug.
11. To strike heavily. Compare slugger.
12. n. A heavy or forcible blow; a hard hit.
13. n. A rather heavy piece of crude metal, frequently rounded in form.
14. n. Specifically— A bullet not regularly formed and truly spherical, such as were frequently used with smooth-bore guns or old-fashioned rifies. These were sometimes hammered, sometimes chewed into an approximately spherical form.
15. n. Hence— Any projectile of irregular shape, as one of the pieces constituting mitraille
16. n. A thick blank of typemetal made to separate lines of print and to show a line of white space; also, such a piece with a number or word, to be used temporarily as a direction or marking for any purpose, as in newspaper composing-rooms the distinctive number placed at the beginning of a compositor's “take,” to mark it as his work. Thin blanks are known as leads. All blanks thicker than one sixteenth of an inch are known as slugs, and are called by the names of their proper typebodies: as, nonpareil slugs; pica slugs In metallurgy, a mass of partially roasted ore.
17. n. A stunted horn. Compare scur.
18. To load with a slug or slugs, as a gun.
19. In gunnery, to assume the sectional shape of the bore when fired: said of a bullet slightly larger than the bore.
20. n. In mining, a loop made in a rope for convenience in descending a shallow shaft, the miner putting his leg through the loop, by which he is supported while being lowered by the man at the windlass.
21. n. A lead of extra thickness used to widen the space between lines of type.
22. n. In mech., a name proposed by Worthington for the mass to which a gravitational unit of force must be applied to produce a foot-pound unit of acceleration; 32.2 (or g) times the mass of a standard pound.

Wiktionary

1. n. Any of many terrestrial pulmonate gastropod mollusks, having no (or only rudimentary) shell
2. n. slang A lazy person, a sluggard.
3. n. A bullet (projectile).
4. n. A counterfeit coin, especially one used to steal from vending machines.
5. n. A shot of a drink, usually alcoholic.
6. n. journalism A title, name or header, a catchline, a short phrase or title to indicate the content of a newspaper or magazine story for editing use.
7. n. physics, rarely used the Imperial (English) unit of mass that accelerates by 1 foot per second squared (1 ft/s²) when a force of one pound-force (lbf) is exerted on it.
8. n. A discrete mass of a material that moves as a unit, usually through another material.
9. n. television editing A black screen.
10. n. A piece of type metal imprinted by a Linotype machine; also a black mark placed in the margin to indicate an error.
11. n. regional A stranger picked up as a passenger to enable legal use of high occupancy vehicle lanes.
12. n. web design The last part of a clean URL, the displayed resource name, similar to a filename.
13. v. To drink quickly; to gulp.
14. v. To down a shot.
15. v. transitive To hit very hard, usually with the fist.
16. v. To take part in casual carpooling; to form ad hoc, informal carpools for commuting, essentially a variation of ride-share commuting and hitchhiking.
17. v. intransitive To become reduced in diameter, or changed in shape, by passing from a larger to a smaller part of the bore of the barrel.

GNU Webster's 1913

1. n. A drone; a slow, lazy fellow; a sluggard.
2. n. obsolete A hindrance; an obstruction.
3. n. (Zoöl.) 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.
4. n. (Zoöl.) Any smooth, soft larva of a sawfly or moth which creeps like a mollusk.
5. n. obsolete A ship that sails slowly.
6. n. An irregularly shaped piece of metal, used as a missile for a gun.
7. n. (Print.) 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.
8. v. obsolete To move slowly; to lie idle.
9. v. obsolete To make sluggish.
10. v. To load with a slug or slugs.
11. v. Cant or Slang To strike heavily.
12. v. 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.

WordNet 3.0

1. n. an amount of an alcoholic drink (usually liquor) that is poured or gulped
2. n. a projectile that is fired from a gun
3. v. be idle; exist in a changeless situation
4. n. an idle slothful person
5. n. any of various terrestrial gastropods having an elongated slimy body and no external shell
6. n. a counterfeit coin
7. n. (boxing) a blow with the fist
8. n. 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
9. n. a strip of type metal used for spacing
10. v. strike heavily, especially with the fist or a bat