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overturn (v.): early 13c., of a wheel, "to rotate, roll over," from over- + turn (v.). Attested from c. 1300 in general transitive sense "to throw over violently;" figurative meaning "to ruin, destroy" is from late 14c. Of judicial decisions, "to reverse," it is attested from 1826. Related: Overturned; overturning.
topsy-turvy (adv.): 1520s, "but prob. in popular use from an earlier period" [OED]; compare top over terve "to fall over" (mid-15c.); likely from tops, plural of top (n.1) "highest point" + obsolete terve "turn upside down, topple over," from Old English tearflian "to roll over, overturn," from Proto-Germanic *terbanan (cognates: Old High German zerben "to turn round"). Century Dictionary calls it "A word which, owing to its popular nature, its alliterative type, and to ignorance of its origin, leading to various perversions made to suggest some plausible origin, has undergone, besides the usual variations of spelling, extraordinary modifications of form." It lists 31 variations. As an adjective from 1610s.
welt (n.): early 15c., a shoemaker's term, perhaps related to Middle English welten "to overturn, roll over" (c. 1300), from Old Norse velta "to roll" (related to welter (v.)). Meaning "ridge on the skin from a wound" is first recorded 1800.