Where does “kneejoint” come from?

kneejoint (English) comes from English joint, from Middle English upon, from Middle English up-, from Old English ūp-, from Old English ūp, from Proto-Germanic upp, from Proto-Germanic ub, from Proto-Indo-European upó.

kneejoint (English): The joint of the knee; A toggle joint; so called...

Definitions

  1. The joint of the knee; A toggle joint; so called...

Ancestry of “kneejoint”, step by step

kneejoint traces back through two separate lines of ancestry.

via English joint

StepLanguageWordMeaning
1EnglishjointDone by two or more people or organisations...
2Middle Englishuponupon
3Middle Englishup-
4Old Englishūp-up-
5Old Englishūpup, from above
6Proto-Germanicuppup, upwards
7Proto-Germanicubunder
8Proto-Indo-Europeanupóunder, below
9Proto-Indo-Europeanh₃ewp-

via English knee

StepLanguageWordMeaning
1EnglishkneeIn humans, the joint or the region of the joint...
2Middle EnglishknēThe knee or a similar joint in other animals
3Old Englishcnēogeneration
4Proto-West Germanickneuknee
5Proto-Germanicknewąknee
6Proto-Indo-Europeanǵnéwo-knee
7Proto-Indo-Europeanǵónuknee
Every word from Proto-Indo-European h₃ewp-Every word from Proto-Indo-European upóEvery word from Proto-Germanic ub