knock up
/nɒk ʌp/
"knock-up" is a 7-letter English headword indexed on PlainSpell.
The verdict
“knock up” 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
- 8
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - To put together, fabricate, or assemble, particularly if done hastily or temporarily.
| Property | Value |
|---|---|
| Headword | knock up |
| Language | English |
| Part of speech | Verb |
| IPA | /nɒk ʌp/ |
| Letters | 8 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “knock up” sits in English frequency
Spelling & Dictionary Insight
The English entry for knock up is 8 letters long, classified as a verb, and transcribed in the International Phonetic Alphabet as /nɒk ʌp/. It sits outside the most-frequent rank tiers, which is often why uncommon words generate more spelling variants per reader. Wiktionary records 8 distinct senses for this headword, so context determines which meaning a reader should apply.
Zero misspellings are on record for knock up in our index, 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 its spelling is unusual enough that it doesn't cluster with a lookalike.
No explicit etymology string is stored for this entry, so its spelling is easiest to reason about phoneme by phoneme, absent a documented history. The correct English form is knock up, spelled K-N-O-C-K- -U-P.
Definition
- 1To put together, fabricate, or assemble, particularly if done hastily or temporarily.
- 2To awaken (someone) as by knocking at the door; rouse; call; summon; also, to go door-to-door on election day to persuade a candidate's supporters to go to the polling station and vote. See also knocker up.
- 3To exhaust; wear out; tire out; to fatigue until unable to do more.
- 4To become exhausted or worn out; to fail of strength; to become wearied, as with labor; to give out.
- 5To impregnate, especially out of wedlock. See knocked up.
- 6To gently hit the ball back and forth before a tennis match, as practice or warm-up, and to gauge the state of the playing surface, lighting, etc. See knock-up.
- 7To make even at the edges, or to shape into book form.
- 8To straighten up a stack of paper.
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 “knock up”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is K-N-O-C-K- -U-P - every other letter order is a misspelling in standard orthography.
- Say it as /nɒk ʌp/ (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.