Etymology

upside down

Today it means: Inverted, so that the top is now at the bottom. Full definition →

Middle English up sid doun
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upside down · adverb, adjective, proper noun1

  1. Middle English · inherited fromup sid doun
  2. English todayupside down

From Middle English up sid doun, an alteration of earlier upsadowne, upsedowne, up-so-doun (“upside down”), equivalent to up + so + down, literally “up as down”.

Upside Down · proper noun2

Coined by Stranger Things.

Etymology from Wiktionary, CC BY-SA 4.0.