Where does “downside” come from?

Downside combines English down from Middle English down, Old English dūn, Proto-Celtic dūnom, and Gaulish dunum, ultimately from Proto-Indo-European h₂epo meaning away or off.

downside (English): A disadvantageous aspect of something that is...

Definitions

  1. A disadvantageous aspect of something that is...

Ancestry of “downside”, step by step

downside traces back through 3 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 Down

StepLanguageWordMeaning
1EnglishDownusually known as County Down
2Middle Englishdoundown
3Old Englishdūnhill, down; hill, dune; hill, mountain
4Proto-Germanic*dūnā
5Proto-Celticdūnomstronghold, rampart
6Proto-Indo-Europeandʰewh₂-smoke; mist, haze

via English [[down

StepLanguageWordMeaning
1English[[down
Every word from Proto-Indo-European seh₂-
downside — Etymology, Origin & Word History | Etymology Explorer