Definition of "Tack" :
noun: sailing a zigzag course
noun: (nautical) the act of changing tack
noun: (nautical) a line (rope or chain) that regulates the angle at which a sail is set in relation to the wind
noun: gear for a horse
noun: a short nail with a sharp point and a large head
noun: the heading or position of a vessel relative to the trim of its sails
verb: reverse (a direction, attitude, or course of action)
verb: fix to; attach
verb: sew together loosely, with large stitches
verb: fasten with tacks
"Tack the notice on the board."
verb: create by putting components or members together
"He tacked together some verses."
verb: turn into the wind
"The sailors decided to tack the boat."