flat out
/ˌflæt ˈaʊt/
"flat-out" is a 7-letter English headword indexed on PlainSpell.
The verdict
“flat out” is outside the top-ranked English vocabulary, used as an adjective - the kind of word writers most often double-check.
- Unranked
- below top-frequency English
- 8
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Used other than figuratively or idiomatically: see flat, out.
| Property | Value |
|---|---|
| Headword | flat out |
| Language | English |
| Part of speech | Adjective |
| IPA | /ˌflæt ˈaʊt/ |
| Letters | 8 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “flat out” sits in English frequency
Spelling & Dictionary Insight
The English entry for flat out is 8 letters long, classified as an adjective, and transcribed in the International Phonetic Alphabet as /ˌflæt ˈaʊt/. It sits outside the most-frequent rank tiers, which is often why uncommon words generate more spelling variants per reader. Wiktionary records 4 distinct senses for this headword, so context determines which meaning a reader should apply.
No misspelling variants are generated for flat out in our index, which points to an orthography that plays by predictable English rules. Our confusable-pair dataset has no match for it, which usually means its spelling is distinct enough that readers don't reach for a similar-looking word instead.
This entry carries no recorded etymology, so any spelling logic here comes from how the word's sounds map to letters, not a documented origin story. The correct English form is flat out, spelled F-L-A-T- -O-U-T.
Definition
- 1Used other than figuratively or idiomatically: see flat, out.
- 2Complete, total, downright.
- 3Very busy.
- 4Lazy, sleeping.
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.
Frequently Asked Questions
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Using “flat out”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is F-L-A-T- -O-U-T - every other letter order is a misspelling in standard orthography.
- Say it as /ˌflæt ˈaʊt/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Browse more English words and confusable pairs in the same reference. English words
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.