Princeton's WordNet

1. tack(noun)

   the heading or position of a vessel relative to the trim of its sails

2. tack(noun)

   a short nail with a sharp point and a large head

3. stable gear, saddlery, tack(noun)

   gear for a horse

4. sheet, tack, mainsheet, weather sheet, shroud(noun)

   (nautical) a line (rope or chain) that regulates the angle at which a sail is set in relation to the wind

5. tack, tacking(noun)

   (nautical) the act of changing tack

6. tack(verb)

   sailing a zigzag course

7. tack(verb)

   fasten with tacks

   "tack the notice on the board"

8. tack, wear round(verb)

   turn into the wind

   "The sailors decided to tack the boat"; "The boat tacked"

9. assemble, piece, put together, set up, tack, tack together(verb)

   create by putting components or members together

   "She pieced a quilt"; "He tacked together some verses"; "They set up a committee"

10. baste, tack(verb)

    sew together loosely, with large stitches

    "baste a hem"

11. append, tag on, tack on, tack, hang on(verb)

    fix to; attach

    "append a charm to the necklace"

12. interchange, tack, switch, alternate, flip, flip-flop(verb)

    reverse (a direction, attitude, or course of action)

Kernerman English Learner's Dictionary

1. tack(verb)æk

   to attach sth onto sth with a tack

   a notice tacked onto the bulletin board

2. tack(noun)æk

   a short nail or a strong pin with a flat top

   advertisements attached to the wall with tacks

3. tackæk

   a way of doing sth; = method

   The second time, we took a different tack.

Wiktionary

1. tack(Noun)

   A small nail with a flat head.

2. tack(Noun)

   A small, sharp, nail-like object used especially to affix thin items to thicker ones, but not heavily used in carpentry.

3. tack(Noun)

   A loose seam used to temporarily fasten pieces of cloth.

4. tack(Noun)

   The lower corner on the leading edge of a sail relative to the direction of the wind.

5. tack(Noun)

   A course or heading that enables a sailing vessel to head upwind. See also reach, gybe.

6. tack(Noun)

   A direction or course of action, especially a new one.

7. tack(Noun)

   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. tack(Noun)

   The distance a sailing vessel runs between these maneuvers when working to windward; a board.

9. tack(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. tack(Verb)

    To nail with a tack (small nail with a flat head).

11. tack(Verb)

    To sew/stich with a tack (loose seam used to temporarily fasten pieces of cloth).

12. tack(Verb)

    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.

13. tack(Verb)

    To add something as an extra item.

    to tack (something) onto (something)

14. tack(Verb)

    Often with "up"", to place the tack on a horse.

15. tack(Noun)

    The stickiness of a compound, related to its cohesive and adhesive properties.

Webster Dictionary

1. Tack(noun)

   a stain; a tache

2. Tack(noun)

   a peculiar flavor or taint; as, a musty tack

3. Tack(noun)

   a small, short, sharp-pointed nail, usually having a broad, flat head

4. Tack(noun)

   that which is attached; a supplement; an appendix. See Tack, v. t., 3

5. Tack(verb)

   a rope used to hold in place the foremost lower corners of the courses when the vessel is closehauled (see Illust. of Ship); also, a rope employed to pull the lower corner of a studding sail to the boom

6. Tack(verb)

   the part of a sail to which the tack is usually fastened; the foremost lower corner of fore-and-aft sails, as of schooners (see Illust. of Sail)

7. Tack(verb)

   the direction of a vessel in regard to the trim of her sails; as, the starboard tack, or port tack; -- the former when she is closehauled with the wind on her starboard side; hence, the run of a vessel on one tack; also, a change of direction

8. Tack(verb)

   a contract by which the use of a thing is set, or let, for hire; a lease

9. Tack(verb)

   confidence; reliance

10. Tack(verb)

    to fasten or attach

11. Tack(verb)

    especially, to attach or secure in a slight or hasty manner, as by stitching or nailing; as, to tack together the sheets of a book; to tack one piece of cloth to another; to tack on a board or shingle; to tack one piece of metal to another by drops of solder

12. Tack(verb)

    in parliamentary usage, to add (a supplement) to a bill; to append; -- often with on or to

13. Tack(verb)

    to change the direction of (a vessel) when sailing closehauled, by putting the helm alee and shifting the tacks and sails so that she will proceed to windward nearly at right angles to her former course

14. Tack(verb)

    to change the direction of a vessel by shifting the position of the helm and sails; also (as said of a vessel), to have her direction changed through the shifting of the helm and sails. See Tack, v. t., 4

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