capo

noun
  1. A device used on the neck of a stringed instrument, such as a guitar, to shorten the playable length of the strings, thereby raising the pitch. noun
    He placed the capo on the third fret to play the song in a higher key.
    Using a capo can make it easier to play certain chords on the guitar.
  2. A leader or head of a criminal organization, especially in the Mafia. noun
    The capo was responsible for overseeing the operations of the family.
    He rose through the ranks to become a capo in the organization.