Tack (sailing)

In sailing, the tack is the lower corner of the sail's leading edge. On a sloop rigged sailboat, the mainsail tack is connected to the mast and the boom at the gooseneck. On the same boat, a foresail tack is clipped to the hull and forestay.

Also, the maneuver where a sailboat (yacht) turns its bow through the wind so that the wind changes from one side to the other. Contrast with gybe.