light a fire under
"light-a-fire-under" is a 15-letter English headword indexed on PlainSpell.
The verdict
“light a fire under” is uncommon English (outside the top frequency list), classed as a verb. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 18
- letters
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - To motivate or encourage (someone) to start sooner or move faster.
Corpus desk
Index EN-light-a-fire-under · light a fire under · English
light a fire under · unranked · 0 variants · 0 confusables
- FREQ-UNRANKED Unranked
- LEN-MEGA 18 letters
- VOW-6 6 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-THIN "L" 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 | light a fire under |
| Language | English |
| Part of speech | Verb |
| Letters | 18 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “light a fire under” in English
Rare enough to double-check
light a fire under is uncommon English outside the top frequency list, classed as averb. Rarity is why readers land here mid-draft. Gloss: "To motivate or encourage (someone) to start sooner or move faster.".
light a fire under doesn't appear in our generated misspelling index, typically a sign the spelling maps closely to how the word sounds. Our dataset records no confusable match here, since nothing in our dataset looks or sounds close enough to cause mix-ups.
Etymologically, the entry records: Referring to a time when, if chimney sweeps were afraid to ascend a chimney, the fire would be lit under them in order to motivate them to climb to the top. The correct English form is light a fire under, spelled L-I-G-H-T- -A- -F-I-R-E- -U-N-D-E-R.
Definition
- 1To motivate or encourage (someone) to start sooner or move faster.
Recorded use
Wiktionary exampleThese source excerpts show how light a fire under appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
Let me see if I can light a fire under the waiter to get our order sooner.
Etymology
Referring to a time when, if chimney sweeps were afraid to ascend a chimney, the fire would be lit under them in order to motivate them to climb to the top.
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.