1
- a small, sharp, broad-headed nail大头钉, 平头钉。
1.1
- N. Amer. a drawing pin〈北美〉图钉。
2
- a long stitch used to fasten fabrics together temporarily, prior to permanent sewing（为定样临时缝上的）粗缝针脚。
3
- Sailing an act of changing course by turning a boat's head into and through the wind, so as to bring the wind on the opposite side【航海】抢风调向。
3.1
- a boat's course relative to the direction of the wind抢风航行路线：
the brig bowled past on the opposite tack.
这只双桅船在顺风道上快速平稳地行驶。
3.2
- a distance sailed between such changes of course抢风航程。
3.3
- figurative a method of dealing with a situation or problem; a course of action or policy〈喻〉（解决问题的）方法; 行动方针, 策略：
as she could not stop him going she tried another tack and insisted on going with him.
因为她不能阻拦他去, 于是她换了个方法坚持要和他一起去。
4
- Sailing a rope for securing the corner of certain sails【航海】（系住帆角的）系帆索。
4.1
- the corner to which such a rope is fastened（用系帆索）系住的帆角。
5
- mass noun the quality of being sticky黏着性, 黏着力：
cooking the sugar to caramel gives tack to the texture.
把糖熬成焦糖能使质地更有黏性。
1
- with obj. and adverbial fasten or fix in place with tacks用平头钉钉：
he used the tool to tack down sheets of fibreboard.
他用工具把纤维板用平头钉钉在一起。
1.1
- fasten (pieces of cloth) together temporarily with long stitches（为定样而）用粗缝针脚缝。
1.2
tack something on
add or append something to something already existing增加; 增补。
2
- no obj. Sailing change course by turning a boat's head into and through the wind【航海】抢风航行。比较
WEAR2 . - ORIGIN: from the practice of shifting ropes (see sense 4) to change direction.
2.1
- with obj. alter the course of (a boat) in such a way使（船）抢风航行。
2.2
- with adverbial of direction make a series of such changes of course while sailing航行中换抢航进：
she spent the entire night tacking back and forth.
她整个晚上都在来回抢风航行。
2.3
- figurative make a change in one's conduct, policy, or direction of attention〈喻〉改变（行为, 政策, 注意方向）。
短语
on the port （或starboard） tack
- Sailing with the wind coming from the port (or starboard) side of the boat【航海】左（或右）弦抢风。
派生词
tacker
noun词源
Middle English （in the general sense 'something that fastens one thing to another'）： probably related to Old French tache 'clasp, large nail'.