noun

1. any of a large number of small, gastropod mollusks, esp. the ones resembling a land snail, but having only a rudimentary internal shell buried in the mantle
2. a smooth, soft moth (family Eucleidae) or sawfly larva, resembling a slug
3. a person, vehicle, etc. that moves sluggishly

Etymology: ME slugge, slow, clumsy person or thing < Scand, as in Swed dial. slogga, to be sluggish < IE base *(s)leu-, to hang loosely, lax > sludge

noun

1. a small piece or lump of metal; specif., a bullet
2. ☆ a piece of metal shaped like and used in place of a coin in automatic coin machines; esp., such a substitute coin when used illegally
3. ☆ Printing
   1. a strip of metal used to add space between lines of type
   2. a line of type made in one piece or strip, as by a linotype machine
   3. a short heading, often a single word, indicating the subject of copy
4. Physics a unit of mass, equal to c. 14.6 kg (c. 32.2 lb), to which a force of one pound imparts an acceleration of one foot per second per second

Etymology: prob. < slug

transitive verb slugged, slugging slug′·ging

noun

Etymology: prob. < Dan sluge, to gulp; akin to Ger schlucken, to swallow < IE base *(s)leug- > OIr slucim, (I) swallow

transitive verb slugged, slugging slug′·ging

Etymology: < dial. (Shetland) slog, slag, a blow < ON slag, akin to OE slean, to strike: see slay

noun