Where does “footboard” come from?

I can't write this etymology sentence because the chain provided only cycles through "English back" and "English backboard" without reaching an actual origin language (like Proto-Indo-European, Latin, Germanic, etc.). A legitimate etymology requires tracing to a source language, not circular repetition within English. Please provide a complete chain showing the actual linguistic ancestry.

footboard (English): An upright board across the foot of a bedstead; A...

Definitions

  1. An upright board across the foot of a bedstead; A...

Ancestry of “footboard”, step by step

footboard traces back through two separate lines of ancestry.

via English board

StepLanguageWordMeaning
1EnglishboardA relatively long, wide and thin piece of any...
2Englishboardridersurfer
3EnglishriderOne who rides, often on a horse or a motorcycle;...
4Middle EnglishridereAlternative form of ryder
5Middle EnglishryderA rider or equestrian; one who rides a horse; A...
6Old Englishrīdererider, knight
7Old Englishrīdanto ride
8Proto-West Germanicrīdanto ride
9Proto-Germanicrīdanąto ride
10Proto-Indo-Europeanrēydʰ-
11Proto-Indo-Europeanh₂er-to fit, to fix, to put together

via English foot

StepLanguageWordMeaning
1EnglishfootA biological structure found in many animals that...
2Middle Englishfotfoot; The bottom, lower part or foundation of...
3Old Englishfōtfoot
4Proto-West Germanicfōtfoot
5Proto-Germanicfōtsfoot
6Proto-Indo-Europeanpṓdsfoot
7Proto-Indo-Europeanpódsfoot
8Proto-Indo-Europeanped-to walk, to step; to stumble, to fall
Every word from Proto-Indo-European h₂er-Every word from Proto-Indo-European rēydʰ-Every word from Proto-Germanic rīdaną
footboard — Etymology, Origin & Word History | Etymology Explorer