Wiktionary
n. One of a group of chairpersons. vb. (context transitive intransitive English) To serve as a co-chair (on).
Usage examples of "co-chair".
Millie Leroux, co-chair of the reunion committee, said eagerly, "We sent him a handwritten invitation c/o the address Kate gave us.
Poor Laura, who'll have to hold her head up now that her ex is marrying her former co-chair of the Garden Club.
Well, after getting an A on my report, plus the offer to co-chair the project, I was flying.
Before long we had a big steering committee co-chaired by two lawyers I’d met through the DLC, John Broderick and Terry Schumaker, whose office, fortuitously, was in the same building that more than a century earlier had housed the law office of Governor Franklin Pierce.
I wasn’t hurt, but one of my co-chairs, Calvin Smyre, an African-American state representative, wasn’t so lucky.
Ryan found his desk neatly piled with material too sensitive for the car's dispatch case, and prepped himself for the morning department-head meeting, which he co-chaired with the DCI.
Over the next two weeks, I kept two of my commitments from the budget battle: I went to Marjorie Margolies-Mezvinsky’s district for the conference on entitlements, and I appointed Bob Kerrey as co-chair, along with Senator John Danforth of Missouri, of a commission to study Social Security and other entitlements.