light up

verb

By · According to Wiktionary data (CC BY-SA) ·

"light-up" is a 7-letter English headword indexed on PlainSpell.

The verdict

“light 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 illuminate, to bring light to something, to brighten.

Key facts for light up
PropertyValue
Headwordlight up
LanguageEnglish
Part of speechVerb
Letters8
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Where “light up” sits in English frequency

light up falls outside the top-100,000 ranked English words, the long-tail zone of technical, archaic, or low-frequency vocabulary, exactly where readers second-guess spellings most.

Beyond rank #100,000. Source: FrequencyWords open word-frequency list.

Spelling & Dictionary Insight

The English entry for light up is 8 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. Wiktionary records 11 distinct senses for this headword, so context determines which meaning a reader should apply.

No generated misspelling entries exist for light up in our index, which points to an orthography that plays by predictable English rules. Our confusable-pair dataset has no match for it, which usually means its spelling is distinct enough that readers don't reach for a similar-looking word instead.

Etymologically, the entry records: Phrasal verb from light (“to make bright, ignite”, verb) + up (“to a higher degree”, adverb). The correct English form is light up, spelled L-I-G-H-T- -U-P.

Definition

  1. 1
    To illuminate, to bring light to something, to brighten.
  2. 2
    To start to emit light; to become activated as a light source.
  3. 3
    To show an increase in activity or a brightening of mood.
  4. 4
    To ignite.
  5. 5
    To light a cigarette, pipe, etc.
  6. 6
    To light a cigarette, pipe, etc. for (someone).
  7. 7
    To make happy.
  8. 8
    To introduce (someone to something), to make someone aware of or interested in something; turn on.
  9. 9
    To open fire on a target or group of targets, especially with rockets, a flamethrower, etc.
  10. 10
    To shock (someone) with a stun gun.
  11. 11
    To activate the emergency sirens on a police vehicle in order to pull someone over.

Etymology

Phrasal verb from light (“to make bright, ignite”, verb) + up (“to a higher degree”, adverb).

This word in other languages

iluminar(Español)

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

How do you spell "light up"?
"light up" is spelled L-I-G-H-T- -U-P.
What does "light up" mean?
As a verb, "light up" means: To illuminate, to bring light to something, to brighten.
What is the origin of the word "light up"?
Phrasal verb from light (“to make bright, ignite”, verb) + up (“to a higher degree”, adverb). See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Using “light up”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is L-I-G-H-T- -U-P - 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.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list