[ C ] a small, sharp nail with a flat end

[ C ] a long, loose stitch

[ U ] all the objects that the rider of a horse needs, including saddles and bridles

[ C ] the direction or distance that a boat moves at an angle to the direction of the wind, so that the boat receives the wind on its sails:

[ T ] to fasten something to a place with tacks

[ I or T ] also mainly US baste to sew with a long, loose stitch that holds two pieces of material together temporarily, before they are sewn together in a more tidy or permanent way

[ I usually + adv/prep ] (of a boat) to turn so that it is at an angle to the direction of the wind and receives the wind on its sails