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Related to tack up: tack onto
1. To affix something onto a higher thing, place, or surface with or as with tacks. A noun or pronoun can be used between "tack" and "up." I've got a temp job tacking up fliers all over town for the mayor's re-election campaign. We've been tacking plywood up against all our windows to keep them from getting damaged in the storm.
2. To fit a horse with its saddle and bridle. A noun or pronoun can be used between "tack" and "up." My job is to tack up the horses before the guests take them out in the morning. In addition to learning how to ride horses, kids come to our camp to learn how to clean them, groom them, and tack them up.
tack something up
to fasten something onto something with tacks. The drapes started to fall, so we tacked them up again. Please tack up these posters.
1. To post something with or as if with a tack: I tacked up a poster of my favorite band. The teacher tacked the best students' essays up on the wall.
2. To outfit a horse with a harness and saddle: The cowboy tacked up the horse. We can take the horses out for a ride after you've tacked them up.