tack
noun uk/tæk/ us/tæk/
(NAIL)
[ C ]图钉，大头钉
a small, sharp nail with a flat end
(SEWING)
[ C ]（为定样临时缝上的）粗缝针脚，假缝
a long, loose stitch
(RIDING EQUIPMENT)
[ U ]鞍辔，马具
all the objects that the rider of a horse needs, including saddles and bridles
(BOAT'S DIRECTION)
[ C ]（船）戗风航行；戗风调向
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
The ship was on the starboard tack. 那艘船右舷戗风航行。
tack
verb uk/tæk/ us/tæk/
(FASTEN)
[ T ]用图钉钉
to fasten something to a place with tacks
(SEW)
[ I or T ] fabrics (also mainly US baste)（为定样而）用粗缝针脚缝
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
(BOAT)
[ I usually + adv/prep ]（船）戗风航行；戗风调向
(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
Phrasal verb
tack something on （临时）增补，附加
to add something that you had not planned to add, often without much preparation or thought
At the last minute they tacked on a couple of extra visits to my schedule. 在最后一刻，他们在我的日程安排上增加了几项额外的参观活动。