This meaning refers to fixing something temporarily or lightly using tacks, stitches, or another fastener.
Tack the fabric in place before sewing.
He tacked the photograph to the wall.
In sailing, tack refers to a vessel's direction in relation to the wind or a maneuver changing that direction.
The yacht changed tack near the shore.
We sailed on a northward tack.
This figurative meaning refers to changing or choosing a particular method, argument, or strategy.
The negotiators tried a different tack.
Her direct tack produced better results.
This meaning refers collectively to saddles, bridles, reins, and other equipment used with horses.
The rider cleaned the tack after training.
The stable stores saddles and other tack.