Where does “upthread” come from?

upthread (English) comes from English thread, from Middle English þred, from Old English þrǣd, from Proto-Germanic þrēduz, from Proto-Indo-European treh₁-tu-, from Proto-Indo-European terh₁- — to rub, turn; to drill, pierce.

upthread (English): Previously, or hierarchically higher, in a thread...

Definitions

Previously, or hierarchically higher, in a thread...

Ancestry of “upthread”, step by step

upthread traces back through two separate lines of ancestry.

via English thread

Step	Language	Word	Meaning
1	English	thread	A long, thin and flexible form of material,...
2	Middle English	þred	thread (of twine or fibre)
3	Old English	þrǣd	—
4	Proto-Germanic	þrēduz	thread, twisted fibre
5	Proto-Indo-European	treh₁-tu-	—
6	Proto-Indo-European	terh₁-	to rub, turn; to drill, pierce

via English up

Step	Language	Word	Meaning
1	English	up	Away from the surface of the Earth or other...
2	Middle English	up	to a vertical axis
3	Old English	upp	up; upstairs
4	Proto-West Germanic	*upp	—

Every word from Proto-Indo-European terh₁- →Every word from Proto-Indo-European treh₁-tu- →Every word from Proto-Germanic þrēduz →