Definition of jackstaff in English:
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.
Definition of jackstaff in:
- US English dictionary