1774 J. Cook 1 July (1969) II. 447 When they want to change Tacks [they] have only to ease of the sheet and bring the heel or Tack end of the yard to the other end of the Boat and the sheet in like manner.
1867 J. Macgregor App. 296 The tack end of the boom is made fast to the mast by a flat piece of leather.