#1 tack v. fasten with tacks; "tack the notice on the board". wn
#2 tack v. [wear round] turn into the wind; "The sailors decided to tack the boat"; "The boat tacked". wn
#3 tack n. the heading or position of a vessel relative to the trim of its sails. wn
#4 tack n. a short nail with a sharp point and a large head. wn
#5 tack n. [stable gear, saddlery] gear for a horse. wn
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