Definition of jackstaff in English:

jackstaff

Syllabification: jack·staff
Pronunciation: /ˈjakˌstaf
 
/

noun

A short flagpole at a ship’s bow, on which a jack is flown.
More example sentences
  • 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.

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great delight