tack

noun

1.
the heading or position of a vessel relative to the trim of its sails
Derived from:
tack
2.
a short nail with a sharp point and a large head
Derived from:
tack
3.
gear for a horse
saddlery stable gear
4.
(nautical) a line (rope or chain) that regulates the angle at which a sail is set in relation to the wind
mainsheet sheet shroud weather sheet
Derived from:
tack
5.
(nautical) the act of changing tack
tacking
Derived from:
tack
6.
sailing a zigzag course