mouth off

verb

"mouth-off" is a 8-letter English headword indexed on PlainSpell.

The verdict

“mouth off” is uncommon English (outside the top frequency list), classed as a verb. The kind of spelling people second-guess.

Unranked
below top-frequency English
9
letters

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - To complain or otherwise express oneself in a loud, immoderate manner.

Corpus desk

Index EN-mouth-off · mouth off · English

mouth off · unranked · 0 variants · 0 confusables

  • FREQ-UNRANKED Unranked
  • LEN-LONG 9 letters
  • VOW-3 3 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-THIN "M" 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.

Key facts for mouth off
PropertyValue
Headwordmouth off
LanguageEnglish
Part of speechVerb
Letters9
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “mouth off” in English

mouth offfalls 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.

Rare enough to double-check

mouth off is uncommon English outside the top frequency list, classed as averb. Rarity is why readers land here mid-draft. 2 senses are on record.

mouth off doesn't appear in our generated misspelling index, since its letter sequence doesn't invite the usual edit-distance slips. It is not paired with a close-neighbour confusable in our dataset, which tends to mean the word is visually distinctive enough to stand on its own.

Etymologically, the entry records: From mouth + off. The correct English form is mouth off, spelled M-O-U-T-H- -O-F-F.

Definition

  1. 1
    To complain or otherwise express oneself in a loud, immoderate manner.
  2. 2
    To talk impudently, especially to one's superior.

Recorded use

Wiktionary example

These source excerpts show how mouth off appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. And don't you mouth off to me, or I'm gonna slap you right in your penis.

Etymology

From mouth + off.

Synonyms

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

How do you spell "mouth off"?
"mouth off" is spelled M-O-U-T-H- -O-F-F.
What does "mouth off" mean?
As a verb, "mouth off" means: To complain or otherwise express oneself in a loud, immoderate manner.
What is the origin of the word "mouth off"?
From mouth + off. 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.

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

Source: FrequencyWords open word-frequency list