Etymology
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farrow (n.)
Old English fearh "young pig," from Proto-Germanic *farkhaz "young pig" (source also of Middle Low German ferken, Dutch varken, both diminutives; Old High German farh, German Ferkel "young pig, suckling pig," and the second element in aardvark), from PIE root *porko- "young pig." Sense of "a litter of pigs" first recorded 1570s, probably via the verb ("to bring forth piglets," of a sow), which is attested from early 13c.
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piglet (n.)

"a small or young pig," 1883, from pig (n.1) + diminutive suffix -let. Earlier name for baby pig was farrow.

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*porko- 

Proto-Indo-European root meaning "young pig."

It forms all or part of: aardvark; farrow; porcelain; porcine; pork; porcupine; porpoise.

It is the hypothetical source of/evidence for its existence is provided by: Latin porcus "pig, tame swine," Umbrian purka; Old Church Slavonic prase "young pig;" Lithuanian paršas "pig;" Middle Dutch varken, German Ferkel, Old English fearh "pig, small pig."

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pig (v.)

mid-15c., piggen, of sows, "to farrow, to bring forth piglets," from pig (n.1). By 1670s as "to huddle together in a dirty or disorderly manner, as pigs do, hence, generally, "to act or live like a pig" in any sense. Related: Pigged; pigging. Colloquial pig out "eat voraciously" is attested by 1979.

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pipsqueak (n.)

also pip-squeak, contemptuous name for an insignificant person, 1910, from the trivial noise a young or weak creature makes. In World War I it was the soldier's slang name for a small German shell "which makes both a pip and a squeak when it comes over the trenches" [Farrow, "Dictionary of Military Terms," 1918]. Pip and Squeak (and later Wilfred), the beloved English comic strip animals, debuted May 1919 in the children's section of the Daily Mirror. To squeeze (something) until the pips squeak "exact the maximum from" is attested by 1918, from pip (n.1).  

The grossest spectacle was provided by Sir Eric Geddes in the Guildhall at Cambridge. An earlier speech in which, in a moment of injudicious candour, he had cast doubts on the possibility of extracting from Germany the whole cost of the war had been the object of serious suspicion, and he had therefore a reputation to regain. "We will get out of her all you can squeeze out of a lemon and a bit more," the penitent shouted, "I will squeeze her until you can hear the pips squeak" ; his policy was to take every bit of property belonging to Germans in neutral and Allied countries, and all her gold and silver and her jewels, and the contents of her picture-galleries and libraries, to sell the proceeds for the Allies' benefit. [John Maynard Keynes, "The Economic Consequences of Peace," 1919]
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