tack

tack (http://definr.com/tack)

     n 1: the heading or position of a vessel relative to the trim of
          its sails
     2: a short nail with a sharp point and a large head
     3: gear for a horse [syn: stable gear, saddlery]
     4: a line (rope or chain) that regulates the angle at which a
        sail is set in relation to the wind [syn: sheet, mainsheet,
         weather sheet, shroud]
     5: (nautical) the act of changing tack [syn: tacking]
     6: sailing a zigzag course
     v 1: fasten with tacks; "tack the notice on the board"
     2: turn into the wind; "The sailors decided to tack" [syn: {wear
        round}]