cosponsor

noun

co·​spon·​sor (ˌ)kō-ˈspän(t)-sər 

variants or co-sponsor

plural cosponsors or co-sponsors

: a joint sponsor

The senator was a cosponsor for both bills.

Michigan Tech Student Relay For Life is a participating cosponsor of this event.

—The Daily Mining Gazette

cosponsor transitive verb

or co-sponsor

cosponsored or co-sponsored; cosponsoring or co-sponsoring

This year Simpson is carrying on the legislative struggle without Mazzoli, who has declined to cosponsor the bill without support from the Democratic House leadership …

—George Russell

The following summer, Bingham returned to Machu Picchu with an expedition co-sponsored by the National Geographic Society.

—Duane Damon

cosponsorship

(ˌ)kō-ˈspän(t)-sər-ˌship 

noun

or co-sponsorship

Increasingly, large urban malls are being built with the co-sponsorship of city governments.

—Witold Rybczynski

Examples of cosponsor in a Sentence

Recent Examples on the Web

By the numbers: Cruz's resolution is up to 12 cosponsors as of this writing. —Brady Dale, Axios, 20 Feb. 2025

There were 69 cosponsors on the bill, all of them Republican. —Stephanie McNeal, Glamour, 5 Feb. 2025

Smith was among the cosponsors of a bipartisan hydro tax credit bill in 2023. —Daniel Moore, Axios, 10 Feb. 2025

This time, Biggs does not have any cosponsors on his bill. —Jamie Ducharme, TIME, 6 Feb. 2025

Word History

First Known Use

1849, in the meaning defined above

Rhymes for cosponsor

• sponsor