rack one's brain
"rack-one-s-brain" is a 13-letter English headword indexed on PlainSpell.
The verdict
“rack one's brain” is uncommon English (outside the top frequency list), classed as a verb. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 16
- letters
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - To struggle to think of or remember something.
Corpus desk
Index EN-rack-one-s-brain · rack one's brain · English
rack one's brain · unranked · 0 variants · 0 confusables
- FREQ-UNRANKED Unranked
- LEN-MEGA 16 letters
- VOW-5 5 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-THIN "R" 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 | rack one's brain |
| Language | English |
| Part of speech | Verb |
| Letters | 16 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “rack one's brain” in English
Rare enough to double-check
rack one's brain is uncommon English outside the top frequency list, classed as averb. Rarity is why readers land here mid-draft. Gloss: "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.
Recorded use
Wiktionary examplesThese source excerpts show how rack one's brain appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
I have been racking my brain all day trying to think of a birthday present for her.
Let’s face it – math isn’t for everyone. If you’re done racking your brains over a question based on quadratic equations, differential calculus, or even lengthy word problems, and can’t for the life of you figure out what’s what, then perhaps it’s time you let ChatGPT take up the role of a home tutor.
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.