rack one's brain
"rack-one-s-brain" is a 13-letter English headword indexed on PlainSpell.
The verdict
“rack one's brain” is outside the top-ranked English vocabulary, used as a verb - the kind of word writers most often double-check.
- Unranked
- below top-frequency English
- 16
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - To struggle to think of or remember something.
| Property | Value |
|---|---|
| Headword | rack one's brain |
| Language | English |
| Part of speech | Verb |
| Letters | 16 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “rack one's brain” sits in English frequency
Spelling & Dictionary Insight
The English entry for rack one's brain is 16 letters long, classified as a verb. It sits outside the most-frequent rank tiers, which is often why uncommon words generate more spelling variants per reader. The dominant gloss from Wiktionary reads: "To struggle to think of or remember something.".
We couldn't generate a plausible misspelling set for rack one's brain, since its letter pattern doesn't lend itself to common typo substitutions. No close-neighbour confusable shows up for this headword in our dataset, since no other headword is close enough in sound or shape to pair with it.
Etymologically, the entry records: Combination of rack (“medieval torture method”), and brain, thus meaning “to cause the mind extreme discomfort”. Variants include rack one's wit (1583) and rack one's memory, as well as cudgel one's brain / cudgel one's brains. The correct English form is rack one's brain, spelled R-A-C-K- -O-N-E-'-S- -B-R-A-I-N.
Definition
- 1To struggle to think of or remember something.
Etymology
Combination of rack (“medieval torture method”), and brain, thus meaning “to cause the mind extreme discomfort”. Variants include rack one's wit (1583) and rack one's memory, as well as cudgel one's brain / cudgel one's brains.
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.
Frequently Asked Questions
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Using “rack one's brain”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is R-A-C-K- -O-N-E-'-S- -B-R-A-I-N - every other letter order is a misspelling in standard orthography.
- 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.