a young swine of either sex, esp. a domestic hog, Sus scrofa, weighing less than 120 lb. (220 kg.)
2.
any wild or domestic swine.
3.
the flesh of swine; pork.
4.
a person of piglike character, behavior, or habits, as one who is gluttonous, very fat, greedy, selfish, or filthy.
5.
Slang. a slatternly, sluttish woman.
6.
Disparaging. a police officer.
7.
Machinery. any tool or device, as a long-handled brush or scraper, used to clear the interior of a pipe or duct.
8.
Metallurgy.
a.
an oblong mass of metal that has been run while still molten into a mold of sand or the like, esp. such a mass of iron from a blast furnace.
b.
one of the molds for such masses of metal.
c.
metal in the form of such masses.
d.
pig iron.
–verb (used with object)
9.
to mold (metal) into pigs.
10.
Informal. to eat (something) quickly; gulp: He pigged three doughnuts and ran off to school.
–verb (used without object)
11.
to bring forth pigs; farrow.
—Verb phrase
12.
pig out, Slang. to overindulge in eating: We pigged out on pizza last night.
—Idioms
13.
on the pig's back, AustralianSlang. in a fortunate position.
14.
pig it,
a.
to live like a pig, esp. in dirt.
b.
to lead a disorganized, makeshift life; live without plan or pattern.
Origin: 1175–1225; ME pigge young pig, with doubled consonant appropriate to terms for smaller animals (cf. dog, frog1) but with no obvious relations; almost certainly not akin to LG, D big(ge), MD vigghe young pig, which involve further obscurities; if Dan pige, Sw piga maid, young girl are compared, perh. < ON word meaning “young, small,” applied in Scand to girls but in OE to swine
Any of several mammals of the family Suidae, having short legs, cloven hooves, bristly hair, and a cartilaginous snout used for digging, especially the domesticated hog, Sus scrofa domesticus, when young or of comparatively small size.
The edible parts of one of these mammals.
A crude block of metal, chiefly iron or lead, poured from a smelting furnace.
A mold in which such metal is cast.
Pig iron.
Informal A person regarded as being piglike, greedy, or gross.
A crude block of metal, chiefly iron or lead, poured from a smelting furnace.
A mold in which such metal is cast.
Pig iron.
Offensive Slang Used as a disparaging term for a police officer.
Slang A member of the social or political establishment, especially one holding sexist or racist views.
intr.v.
pigged, pig·ging, pigs To give birth to pigs; farrow. Phrasal Verb(s): pig out Slang To eat ravenously; gorge oneself: "a parent who asks a child, 'Would you like to pig out on pizza?'"(George F. Will).
Idiom(s):
in a pig's eye Slang Under no condition; never.
Idiom(s):
pig in a pokeSomething that is offered in a manner that conceals its true nature or value.
Idiom(s):
pig it Slang To live in a piglike fashion.
[Middle English pigge, young pig, probably from Old English *picga.]
[pig] 
noun, verb, pigged, pig⋅ging.