Definition of jackstaff in English:

jackstaff

noun

  • A short staff at a ship's bow, on which a jack is hoisted.

    • ‘Navy ships not under way also hoist and lower the union jack on the jackstaff, at the ship's bow, and at morning and evening colors.’
    • ‘Navy ships not underway fly the union jack on the jackstaff. The union jack is also flown from a yardarm to denote that a general court-martial is in session.’

Pronunciation:

jackstaff

/ˈdʒakstɑːf/