cosign
/ˈkəʊ.saɪn/
"cosign" is a 6-letter English headword indexed on PlainSpell.
The verdict
“cosign” is uncommon English (frequency #94,715 among 43,570 “C” headwords), classed as a verb. The kind of spelling people second-guess.
- #94,715
- frequency rank, English
- 43,570
- “C” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - To sign a document jointly with another person, sometimes as an endorsement.
| Property | Value |
|---|---|
| Headword | cosign |
| Language | English |
| Part of speech | Verb |
| IPA | /ˈkəʊ.saɪn/ |
| Letters | 6 |
| Frequency rank | #94,715 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “cosign” sits in English frequency
Rare enough to double-check
cosign is uncommon English at frequency #94,715 among 43,570 “C” headwords, classed as averb, transcribed /ˈkəʊ.saɪn/. Rarity is why readers land here mid-draft. 2 senses are on record.
The misspelling generator found no plausible variants for cosign, since its letter pattern doesn't lend itself to common typo substitutions. It is not paired with a close-neighbour confusable in our dataset, suggesting its spelling stands apart enough that readers rarely confuse it with something else.
Etymologically, the entry records: From co- + sign. The correct English form is cosign, spelled C-O-S-I-G-N.
Definition
- 1To sign a document jointly with another person, sometimes as an endorsement.
- 2To agree with or endorse.
Etymology
From co- + sign.
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); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “cosign”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is C-O-S-I-G-N - every other letter order is a misspelling in standard orthography.
- Say it as /ˈkəʊ.saɪn/ (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
Other uncommon English words near this rank
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.