What is the meaning of tack?

noun

• The heading or position of a vessel relative to the trim of its sails.
• A short nail with a sharp point and a large head.
• Gear for a horse.
  • synonyms: stable gear, saddlery
• Nautical) a line (rope or chain) that regulates the angle at which a sail is set in relation to the wind.
  • synonyms: sheet, mainsheet, weather sheet, shroud
• Nautical) the act of changing tack.
  • synonyms: tacking
• Sailing a zigzag course.

verb

• Fasten with tacks.
  • usage: "tack the notice on the board"
• Turn into the wind.
  • usage: "The sailors decided to tack the boat"; "The boat tacked"
  • synonyms: wear round
• Create by putting components or members together.
  • usage: "She pieced a quilt"; "He tacked together some verses"; "They set up a committee"
  • synonyms: assemble, piece, put together, set up, tack together
• Sew together loosely, with large stitches.
  • usage: "baste a hem"
  • synonyms: baste
• Fix to; attach.
  • usage: "append a charm to the necklace"
  • synonyms: append, tag on, tack on, hang on
• Reverse (a direction, attitude, or course of action. ).
  • synonyms: interchange, switch, alternate, flip, flip-flop