Definitions from Wiktionary ( )

▸ noun:  A small nail with a flat head.
▸ noun:  A thumbtack.
▸ noun:  (sewing) A loose seam used to temporarily fasten pieces of cloth.
▸ noun:  (nautical) The lower corner on the leading edge of a sail relative to the direction of the wind.
▸ noun:  (nautical) A course or heading that enables a sailing vessel to head upwind.
▸ noun:  (figurative) A direction or course of action, especially a new one; a method or approach to solving a problem.
▸ 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.
▸ noun:  (nautical) The distance a sailing vessel runs between these maneuvers when working to windward; a board.
▸ noun:  (nautical) A 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.
▸ noun:  Any of the various equipment and accessories worn by horses in the course of their use as domesticated animals.
▸ noun:  (manufacturing, construction, chemistry) The stickiness of a compound, related to its cohesive and adhesive properties.
▸ noun:  Food generally; fare, especially of the bread kind.
▸ noun:  That which is attached; a supplement; an appendix.
▸ noun:  (obsolete) Confidence; reliance.
▸ verb:  (transitive) To nail (something) with a tack (small nail with a flat head).
▸ verb:  To sew/stitch with a tack (loose seam used to temporarily fasten pieces of cloth).
▸ verb:  To weld with initial small welds to temporarily fasten in preparation for full welding.
▸ 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.
▸ verb:  (intransitive, nautical) To sail to windward using a series of alternate tacks across the wind.
▸ verb:  To add something as an extra item.
▸ verb:  Synonym of tack up (“to prepare a horse for riding by equipping it with a tack”).
▸ verb:  (slang, obsolete) To join in wedlock.
▸ noun:  A stain; a tache.
▸ noun:  (obsolete) A peculiar flavour or taint.
▸ noun:  (colloquial) That which is tacky; something cheap and gaudy.
▸ noun:  (law, Scotland and Northern England) A contract by which the use of a thing is set, or let, for hire; a lease.
▸ noun:  A surname.

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