A Quick and Simple Dictionary

tack

1. Noun.  (carpentry) A small nail with a flat head.
2. Noun.  A small, sharp, nail-like object used especially to affix thin items to thicker ones, but not heavily used in carpentry.
3. Noun.  (sewing) A loose seam used to temporarily fasten pieces of cloth.
4. Noun.  (nautical) The lower corner on the leading edge of a sail relative to the direction of the wind.
5. Noun.  (nautical) A course or heading that enables a sailing vessel to head upwind. See also reach, gybe.
6. Noun.  A direction or course of action, especially a new one.
7. Noun.  (nautical) The maneuver by which a sailing vessel turns its bow through the wind so that the wind changes from one side to the other.
8. Noun.  (nautical) The distance a sailing vessel runs between these maneuvers when working to windward; a board.
9. Noun.  Any of the various equipment and accessories worn by horses in the course of their use as domesticated animals. Saddles, stirrups, bridles, halters, reins, bits, harnesses, martingales, and breastplates are all forms of horse '''tack'''.
10. Noun.  (chemistry) The stickiness of a compound, related to its cohesive and adhesive properties.
11. Verb.  To nail with a '''tack''' (small nail with a flat head).
12. Verb.  To sew/stich with a '''tack''' (loose seam used to temporarily fasten pieces of cloth).
13. Verb.  (nautical) To maneuver a sailing vessel so that its bow turns through the wind, i.e. the wind changes from one side of the vessel to the other.
14. Verb.  To add something as an extra item.
15. Verb.  Often with "up"", to place the tack on a horse.