Definitions
1.nounA small nail with a flat head.
2.nounA thumbtack.
3.nounA loose seam used to temporarily fasten pieces of cloth.
4.nounThe lower corner on the leading edge of a sail relative to the direction of the wind.
5.nounA course or heading that enables a sailing vessel to head upwind. See also reach, gybe.
6.nounA direction or course of action, especially a new one.
7.nounThe maneuver by which a sailing vessel turns its bow through the wind so that the wind changes from one side to the other.
8.nounThe distance a sailing vessel runs between these maneuvers when working to windward; a board.
9.nounA rope used to hold in place the foremost lower corners of the courses when the vessel is close-hauled; also, a rope employed to pull the lower corner of a studding sail to the boom.
10.nounAny 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.
11.nounThe stickiness of a compound, related to its cohesive and adhesive properties."The laminate adhesive has very aggressive tack and is hard to move once in place."
12.nounFood generally; fare, especially of the bread kind.
13.nounThat which is attached; a supplement; an appendix.
14.nounA contract by which the use of a thing is set, or let, for hire; a lease.
15.nounConfidence; reliance.
16.verbTo nail with a tack (small nail with a flat head).
17.verbTo sew/stich with a tack (loose seam used to temporarily fasten pieces of cloth).
18.verbTo 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.
19.verbTo add something as an extra item."to tack (something) onto (something)"
20.verbOften paired with "up", to place the tack on a horse.
21.nounA stain; a tache.
22.nounA peculiar flavour or taint."a musty tack"