Standard Lemma guide

cosign

noun · verb · 5 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • UK: /ˈkəʊ.saɪn/
  • US: /ˈkoʊ.saɪn/
  • US: Recorded audio is listed in the source snapshot.
  • UK: Recorded audio is listed in the source snapshot.
  • homophone: cosine

1

noun

Meaning 1

The promotion of one musical artist (usually less successful) by another.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

verb

Meaning 2

To sign a document jointly with another person, sometimes as an endorsement.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

verb

Meaning 3

To agree with or endorse.

Definition source: English Wiktionary via Wiktextract

Usage: informal, transitive

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

verb

Meaning 4

sign and endorse (another person's signature), as for a loan

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: co-sign

Antonyms: none provided

Broader terms: endorse, indorse

5

verb

Meaning 5

sign jointly

Definition source: Princeton WordNet 3.0

Examples

  • Husband and wife co-signed the lease

Meaning relationships

Synonyms: co-sign

Antonyms: none provided

Broader terms: validate, formalize, formalise

History

Etymology

Etymology tree Proto-Indo-European *ḱe? Proto-Indo-European *ḱóm Proto-Italic *kom Proto-Italic *kom- Latin con- Latin co-der. English co- English sign English cosign From co- + sign.

Across languages

Translations

6 source translations are retained for this English entry.

  • French: cosigner — to sign a document jointly with another person
  • German: mitzeichnen — to sign a document jointly with another person
  • German: mitunterzeichnen — to sign a document jointly with another person
  • Italian: cofirmare — to sign a document jointly with another person
  • Portuguese: coassinar — to sign a document jointly with another person
  • Spanish: firmar conjuntamente — to sign a document jointly with another person