Definitions
1.verbTo nail with a tack (small nail with a flat head).
2.verbTo sew/stich with a tack (loose seam used to temporarily fasten pieces of cloth).
3.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.
4.verbTo add something as an extra item."to tack (something) onto (something)"
5.verbOften paired with "up", to place the tack on a horse.
6.nounLoose temporary stitches in dressmaking etc.
7.nounThe act of changing tack.
8.nounA union of securities given at different times, all of which must be redeemed before an intermediate purchaser can interpose a claim.
9.nounThe joining together of consecutive periods of possession of property, especially between squatters in cases of adverse possession.