sheet, tack, mainsheet, weather sheet, shroud -- ((nautical) a line (rope or chain) that regulates the angle at which a sail is set in relation to the wind)
tack, tacking -- ((nautical) the act of changing tack)
tack -- (sailing a zigzag course)
Overview of verb tack
The verb tack has 6 senses
tack -- (fasten with tacks; "tack the notice on the board")
tack, wear round -- (turn into the wind; "The sailors decided to tack the boat"; "The boat tacked")
assemble, piece, put together, set up, tack, tack together -- (create by putting components or members together; "She pieced a quilt"; "He tacked together some verses"; "They set up a committee")
baste, tack -- (sew together loosely, with large stitches; "baste a hem")