fill up
"fill-up" is a 6-letter English headword indexed on PlainSpell.
The verdict
“fill up” is uncommon English (outside the top frequency list), classed as a verb. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 7
- letters
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - To make (something) completely full.
Corpus desk
Index EN-fill-up · fill up · English
fill up · unranked · 0 variants · 0 confusables
- FREQ-UNRANKED Unranked
- LEN-LONG 7 letters
- VOW-2 2 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-THIN "F" 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 | fill up |
| Language | English |
| Part of speech | Verb |
| Letters | 7 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “fill up” in English
Rare enough to double-check
fill up is uncommon English outside the top frequency list, classed as averb. Rarity is why readers land here mid-draft. 10 senses are on record.
We couldn't generate a plausible misspelling set for fill up, and the word's spelling is regular enough that our generator found nothing worth flagging. It is not paired with a close-neighbour confusable in our dataset, which usually means its spelling is distinct enough that readers don't reach for a similar-looking word instead.
No documented word history exists for this headword, so its spelling is best read as a straightforward mapping from sound to letter. The correct English form is fill up, spelled F-I-L-L- -U-P.
Definition
- 1To make (something) completely full.
- 2To fill the tank of a vehicle with fuel.
- 3To become completely full.
- 4To become tearful as a result of strong emotion.
- 5To annoy, or displease, by taunting, or by excessive nagging.
- 6To satisfy the hunger of (someone).
- 7To satisfy one's hunger; to stop being hungry.
- 8To make a full house on the turn or the river.
- 9To fill in / fill out a form etc.
- 10To make complete, to bring to a full development.
Recorded use
Wiktionary examplesThese source excerpts show how fill up appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
It costs a fortune these days to fill up.
"Game over," Waddicor warns. "Look at the fuel gauge. Someone's forgotten to fill up." The heavily laden train has come from Freightliner's Maritime Terminal in Southampton's western docks. Waddicor reckons there might not be enough diesel in the tank to complete the journey.
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.