: to lead (something, such as a group) with one or more other people
They were chosen to co-lead the investigative team.
: to share a lead with another person in a competition
A former U.S. Amateur champion in Byeong Hun An co-leads at 10 under after a second straight 66.—Kevin Casey
plural coleaders or co-leaders
… expedition coleader Roy Glaser slid gingerly around a huge block of rock that seemed solidly attached to the wall.
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