Suck
Old English sūcan (verb), from an Indo-European imitative root; related to soak.
wiktionary
From Middle English souken, suken, from Old English sūcan(“to suck”), from Proto-West Germanic *sūkan, from Proto-Germanic *sūkaną(“to suck, suckle”), from Proto-Indo-European *sewg-, *sewk-(“to suck”). Cognate with Scots souke(“to suck”), obsolete Dutch zuiken(“to suck”), Limburgish zuken, zoeken(“to suck”). Akin also to Old English sūgan(“to suck”), West Frisian sûge, sûge(“to suck”), Dutch zuigen(“to suck”), German saugen(“to suck”), Swedish suga(“to suck”), Icelandic sjúga(“to suck”), Latin sugō(“suck”), Welsh sugno(“suck”). Related to soak.
etymonline
suck (v.)
Old English sucan "to suck," from a Proto-Germanic word of imitative origin (cognates: Old Saxon, Old High German sugan, Old Norse suga, Danish suge, Swedish suga, Middle Dutch sughen, Dutch zuigen, German saugen "to suck"), possibly from the same source as Latin sugere "to suck," succus "juice, sap;" Old Irish sugim, Welsh sugno "to suck;" see sup (v.2). As a noun from c. 1300.
Meaning "do fellatio" is first recorded 1928. Slang sense of "be contemptible" first attested 1971 (the underlying notion is of fellatio). Related: Sucked; sucking. Suck eggs is from 1906. Suck hind tit "be inferior" is American English slang first recorded 1940.
The old, old saying that the runt pig always sucks the hind teat is not so far wrong, as it quite approximates the condition that exists. [The Chester White Journal, April 1921]
