tack
/tæk/📚 10246 2六级A tack or a thumbtack is a short pin with a wide head that you can push with your thumb, especially for a bulletin board. 图钉
noun [物质名词]大头钉，图钉；（为定样临时缝上的）粗缝针脚；马具，鞍辔；（航海）抢风调向，抢风航行路线，抢风航程；（系住帆角的）系帆索；（用系帆索）系住的帆角；行动方针，策略；廉价且难看的物品；黏着性，黏着力；（航海）（系住帆角的）系帆索
A tack is a short nail with a broad, flat head, especially one that is used for fastening carpets to the floor.
平头钉
verb [vt. 及物动词]（用平头钉）钉上，固定住；（为定样而）用粗缝针脚缝；戗风行驶，蜿蜒航行；（尤指画蛇添足地）增补，附加
If you tack pieces of material together, you sew them together with big, loose stitches in order to hold them firmly or check that they fit, before sewing them permanently.
用粗线脚缝
平头钉(tack)的背面(back)是平的
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