Where does “shorthand” come from?

I need to pause here because there's a significant problem with the chain provided. The chain shows "English hand" connecting to "Middle English schort," but "schort" means "short," not "hand." The chain appears to trace only the "short" portion of "shorthand," and it's incomplete for that purpose since it doesn't show how "short" + "hand" combined to form "shorthand." More critically, I cannot write an accurate one-sentence etymology for "shorthand" using only this chain, because: 1. The chain doesn't include the etymology of "hand" 2. The chain doesn't explain when or how "short" and "hand" combined 3. The meaning of "shorthand" (a system of rapid writing) cannot be accurately derived from just knowing "short" comes from Proto-Indo-European (s)ker- (meaning to cut/separate) To follow your rules accurately, I

shorthand (English): A rough and rapid method of writing by...

Definitions

  1. A rough and rapid method of writing by...

Ancestry of “shorthand”, step by step

shorthand traces back through two separate lines of ancestry.

via English Hand

StepLanguageWordMeaning
1EnglishHandThe part of the forelimb below the forearm or wrist in a human, and the corresponding part in many other animals
2Middle Englishhondhand; Alternative form of hound
3Old EnglishhandA hand
4Proto-West Germanichanduhand
5SwedishhandA hand; A hand; the set of cards held by a player
6Old SwedishhandA hand; A direction; A behalf
7Old Norsehǫndhand
8Proto-Germanichanduzhand

via English short

StepLanguageWordMeaning
1EnglishshortHaving a small distance from one end or edge to...
2Middle Englishschortshort as opposed to being tall or long
3Old Englishsċeort
4Proto-West Germanicskurtshort; lacking, deficient
5Proto-Germanicskurtazshort; lacking, deficient
6Proto-Indo-European(s)ḱer-dung, manure, filth; manure, dung, filth

Words derived from “shorthand

Every word from Proto-Germanic handuzEvery word from Old Norse hǫndEvery word from Old Swedish hand