Where does “topside” come from?

I need to identify the etymology chain for "topside" from the provided data, but I notice the chain given appears to be for "side," not "topside." Looking at what's provided: - English side - Middle English side - Old English sīde - Proto-Germanic tuppaz (this seems inconsistent - "tuppaz" doesn't match the "side" chain) - Proto-Indo-European sētis- - Proto-Indo-European sek- The chain appears corrupted or mislabeled. "Topside" would be "top" + "side," so I would need the separate etymology for "top" to be accurate. However, if I'm meant to work only with what's explicitly given and the headword is "topside," I cannot write an accurate sentence because: 1. The chain doesn't clearly trace "topside" (a compound) 2.

topside (English): The side or part of something that is at the top;...

Definitions

  1. The side or part of something that is at the top;...

Ancestry of “topside”, step by step

topside traces back through two separate lines of ancestry.

via English Side

StepLanguageWordMeaning
1EnglishSideA bounding straight edge of a two-dimensional shape
2Middle Englishsidecustom
3Old Englishsīdeside, flank
4Proto-West Germanic*sīdāside
5Medieval Latinsida
6Late LatinsetaAlternative form of saeta; hair, bristle; bristle
7Latinsaetaa bristle, hair on an animal; silk
8Proto-Italicsaitā
9Proto-Indo-Europeanséh₂ito-
10Proto-Indo-Europeansh₂ey-to bind, fetter
11Proto-Indo-Europeanseh₂-to satiate, satisfy

via English top

StepLanguageWordMeaning
1EnglishtopThe highest or uppermost part of something; A...
2Middle EnglishtopThe summit or top of something, especially a...
3Old Englishtopptop, summit (of something)
4Proto-West Germanic*topptop, summit, crest
5Proto-Germanictuppaztuft, plait; top, summit
6Proto-Indo-Europeandumb-tail, rod, staff, pole, penis; tail, rod, staff,...
Every word from Proto-Indo-European seh₂-Every word from Proto-Indo-European sh₂ey-Every word from Proto-Indo-European séh₂ito-