capo

Short definition from Wiktionary

Noun

1. 1
   A movable bar placed across the fingerboard of a guitar and used to raise the pitch of all strings.
2. 2
   A leader in the Mafia; a caporegime.
3. 3
   A leader and organizer of supporters at a sporting event, particularly association football matches.
4. 4
   Alternative spelling of kapo.
5. 5
   Abbreviation of contract agreement purchase order

Proper noun

1. 1
   A surname.