tack in WordNet English dictionary

1. reverse (a direction, attitude, or course of action)
   interchange  tack  switch  alternate  flip  flip-flop 
   
2. fix to; attach
   "append a charm to the necklace"
   append  tag on  tack on  tack  hang on 
   
3. create by putting components or members together
   "She pieced a quilt"; "He tacked together some verses"; "They set up a committee"
   assemble  piece  put together  set up  tack  tack together 
   
4. sew together loosely, with large stitches
   "baste a hem"
   baste  tack 
   
5. fasten with tacks
   "tack the notice on the board"
   tack 
   
6. turn into the wind
   "The sailors decided to tack the boat"; "The boat tacked"
   tack  wear round 
   

1. (nautical) a line (rope or chain) that regulates the angle at which a sail is set in relation to the wind
   sheet  tack  mainsheet  weather sheet  shroud 
   
2. gear for a horse
   stable gear  saddlery  tack 
   
3. sailing a zigzag course
   tack 
   
4. (nautical) the act of changing tack
   tack  tacking 
   
5. a short nail with a sharp point and a large head
   tack 
   
6. the heading or position of a vessel relative to the trim of its sails
   tack