Where does “outside” come from?

Outside derives from Middle English outside, from Old English ūtsīde, combining ūt (out) and sīde (side), from Proto-Germanic sīdǭ ultimately tracing to Proto-Indo-European sek- meaning to cut or divide.

outside (English): The part of something that faces out; the outer...

Definitions

  1. The part of something that faces out; the outer...

Ancestry of “outside”, step by step

outside 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 out

StepLanguageWordMeaning
1EnglishoutAway from the inside, centre or other point of...
2Middle Englishouteout
3Old Englishūtout
4Proto-West Germanic*ūtout, outward
5Proto-Germanicūtout, outward
6Proto-Indo-Europeanúdout, outward

Words derived from “outside

Every word from Proto-Indo-European seh₂-