Where does “double-jointedness” come from?

double-jointedness (English) comes from English double-jointed, from English jointed, from English joint, from Middle English upon, from Middle English up-, from Old English ūp-, from Old English ūp, from Proto-Germanic upp.

double-jointedness (English): The state or quality of being double-jointed

Definitions

  1. The state or quality of being double-jointed

Ancestry of “double-jointedness”, step by step

double-jointedness traces back through two separate lines of ancestry.

via English double-jointed

StepLanguageWordMeaning
1Englishdouble-jointedHaving one or more joints (usually those of the fingers, arms, or legs) able to bend more than is normal; possessing hypermobility of one or more joints
2EnglishjointedHaving joints; Extremely full of people, packed,...
3EnglishjointDone by two or more people or organisations...
4Middle Englishuponupon
5Middle Englishup-
6Old Englishūp-up-
7Old Englishūpup, from above
8Proto-Germanicuppup, upwards
9Proto-Germanicubunder
10Proto-Indo-Europeanupóunder, below
11Proto-Indo-Europeanh₃ewp-

via English Ness

StepLanguageWordMeaning
1EnglishNessAn Ulster princess and the mother of Conchobar mac Nessa and Findchoem in the Ulster Cycle of Irish mythology. Daughter of Eochaid Sálbuide. Also the mother of Cormac Cond Longas by incest with Conchobar mac Nessa
2Middle Englishnesse
3Old Englishnæsnot, not at all; not; first/third-person singular...
4Proto-Germanicnasjąfoothill; headland; cape
5Proto-Indo-Europeannéh₂snose
Every word from Proto-Indo-European h₃ewp-
double-jointedness — Etymology, Origin & Word History | Etymology Explorer