capo UK /ˈkæpəʊ/US /ˈkæpoʊ/noun 2/ˈkeɪpoʊ/ noun 1forms 2 noun2 •A leader in the Mafia; a caporegime. •A leader and organizer of supporters at a sporting event, particularly association football matches. capo UK /ˈkæpəʊ/US /ˈkeɪpoʊ/ noun1 •A movable bar placed across the fingerboard of a guitar and used to raise the pitch of all strings. formscapi · capos