upside down
/ˌʌpsaɪd ˈdaʊn/
"upside-down" is a 10-letter English headword indexed on PlainSpell.
The verdict
“upside down” is uncommon English (outside the top frequency list), classed as an adverb. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 11
- letters
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Inverted, so that the top is now at the bottom.
Corpus desk
Index EN-upside-down · upside down · English
upside down · unranked · 0 variants · 0 confusables
- FREQ-UNRANKED Unranked
- LEN-MEGA 11 letters
- VOW-4 4 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-THIN "U" thin
- PHOTO-UNK Peer pending
Read with this headword: Spelling guide for this pattern
Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.
| Property | Value |
|---|---|
| Headword | upside down |
| Language | English |
| Part of speech | Adverb |
| IPA | /ˌʌpsaɪd ˈdaʊn/ |
| Letters | 11 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “upside down” in English
Rare enough to double-check
upside down is uncommon English outside the top frequency list, classed as anadverb, transcribed /ˌʌpsaɪd ˈdaʊn/. Rarity is why readers land here mid-draft. 2 senses are on record.
The misspelling generator found no plausible variants for upside down, and the word's spelling is regular enough that our generator found nothing worth flagging. This headword has no recorded confusable partner, which tends to mean the word is visually distinctive enough to stand on its own.
Etymologically, the entry records: 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”. The correct English form is upside down, spelled U-P-S-I-D-E- -D-O-W-N.
Definition
- 1Inverted, so that the top is now at the bottom.
- 2In great disorder.
Recorded use
Wiktionary examplesThese source excerpts show how upside down appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
The Union flag was flying upside down, a sign of danger.
His hands were busy with his garments all this time: turning them inside out, putting them on upside down, tearing them, mislaying them, making them parties to every kind of extravagance.
Etymology
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”.
Synonyms
Antonyms
This word in other languages
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.