cocaptain
noun
co·cap·tain ˈkō-ˌkap-tən 
variants or co-captain
plural cocaptains or co-captains
: one of two or more people who are captains of a side or team in a sports contest or similar activity
the cocaptains of a high school football team
Mack had been the one, all their lives, who was good at things: captain of the football team, co-captain of the basketball team, star third baseman.
Richard Bausch
Richard Bausch cocaptain transitive verb
or co-captain
cocaptained or co-captained; cocaptaining or co-captaining
He co-captained the football team and was an all-Coast defensive end selection. The New York Times
The New York Times 
Example Sentences
Recent Examples on the Web Junior Nick Abruzzese, who was ECAC Rookie of the Year in 2019-20 after leading all NCAA freshmen in scoring with 14 goals and 30 assists in 31 games, is serving as cocaptain with Dornbach. BostonGlobe.com, 28 Oct. 2021 There’s the surgeon, a dentist, some engineers, an architect, a computer programmer, and a cocaptain who works for a vegan food company. BostonGlobe.com, 9 July 2021 Maddie McCarthy, cocaptain of the 2021 RedHawks, is the daughter of Mike McCarthy, who was a tight end for Lamb at Natick in the late 1980s. BostonGlobe.com, 17 June 2021 The men’s team includes Robbie Hummel, formerly of the Timberwolves, Canyon Barry (son of Hall of Famer Rick), former Princeton cocaptain Kareem Maddox, and Dominique Jones. BostonGlobe.com, 22 May 2021 He has been listed as cocaptain as the team compiled an 8-4-8 record to stand in sixth place. Frank Dell’apa, BostonGlobe.com, 22 Jan. 2020 Senior Mackenzie Barta and junior Rachel Levy return as cocaptains, but Harvard will miss last year’s leading scorer, Katie Benzan, who is transferring to Texas for a postgraduate program. BostonGlobe.com, 5 Nov. 2019 The team just made it to the quarterfinals, but their success in the tournament wasn't what made headlines this morning; instead a social media frenzy explodied around cocaptain Megan Rapinoe's recent comments. Samantha Leach, Glamour, 26 June 2019 Northeastern cocaptains Dylan Sikura and Adam Gaudette, along with Harvard’s Ryan Donato, were announced Wednesday as three of the 10 finalists for the Hobey Baker Award, given annually to college hockey’s top male player. Henry Brechter, BostonGlobe.com, 14 Mar. 2018 See More
BostonGlobe.com, 28 Oct. 2021 There’s the surgeon, a dentist, some engineers, an architect, a computer programmer, and a cocaptain who works for a vegan food company. BostonGlobe.com, 9 July 2021 Maddie McCarthy, cocaptain of the 2021 RedHawks, is the daughter of Mike McCarthy, who was a tight end for Lamb at Natick in the late 1980s. BostonGlobe.com, 17 June 2021 The men’s team includes Robbie Hummel, formerly of the Timberwolves, Canyon Barry (son of Hall of Famer Rick), former Princeton cocaptain Kareem Maddox, and Dominique Jones. BostonGlobe.com, 22 May 2021 He has been listed as cocaptain as the team compiled an 8-4-8 record to stand in sixth place. Frank Dell’apa, BostonGlobe.com, 22 Jan. 2020 Senior Mackenzie Barta and junior Rachel Levy return as cocaptains, but Harvard will miss last year’s leading scorer, Katie Benzan, who is transferring to Texas for a postgraduate program. BostonGlobe.com, 5 Nov. 2019 The team just made it to the quarterfinals, but their success in the tournament wasn't what made headlines this morning; instead a social media frenzy explodied around cocaptain Megan Rapinoe's recent comments. Samantha Leach, Glamour, 26 June 2019 Northeastern cocaptains Dylan Sikura and Adam Gaudette, along with Harvard’s Ryan Donato, were announced Wednesday as three of the 10 finalists for the Hobey Baker Award, given annually to college hockey’s top male player. Henry Brechter, BostonGlobe.com, 14 Mar. 2018 See More Word History
First Known Use
1928, in the meaning defined above