Cosign
Cosign verb - Sign jointly.
Certify and cosign are semantically related. in pledge topic. In some cases you can use "Certify" instead a verb "Cosign", when it comes to topics like give assurance.
Certify
Certify verb - To declare (something) to be true or genuine.
Mutual synonyms
Cite this Source
Certify and Cosign. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/cosign/certify
Cosign & Certify. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/cosign/certify>.
Certify or Cosign. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/cosign/certify.
Google Ngram Viewer shows how "cosign" and "certify" have occurred on timeline