a small, sharp, broad-headed nail
大头钉，平头钉。
〈北美〉 图钉。
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。
【航海】 抢风调向。
a boat's course relative to the direction of the wind
抢风航行路线
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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。
a distance sailed between such changes of course
抢风航程。
〈喻〉 （解决问题的）方法；行动方针，策略
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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。
【航海】 （系住帆角的）系帆索。
the corner to which such a rope is fastened
（用系帆索）系住的帆角。
[mass noun]the quality of being sticky
黏着性，黏着力
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cooking the sugar to caramel gives tack to the texture .把糖熬成焦糖能使质地更有黏性。
[with obj. and adverbial]fasten or fix in place with tacks
用平头钉钉
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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。
fasten (pieces of cloth) together temporarily with long stitches
（为定样而）用粗缝针脚缝。
(
增加；增补。
[no obj.]
【航 海】 抢风航行。比较
[with obj.]alter the course of (a boat) in such a way
使（船）抢风航行。
[with adverbial of direction]make a series of such changes of course while sailing
航行中换抢航进
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she spent the entire night tacking back and forth .她整个晚上都在来回抢风航行。
〈喻〉 改变（行为，政策，注意方向）。
equipment used in horse riding, including the saddle and bridle
鞍辔；马具。
〈非正式〉 便宜货；劣质品。
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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
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tackn.大头钉；平头钉；粗缝针脚；抢风调向；系帆索；黏着性；黏着力；鞍辔；马具；便宜货；劣质品
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lackn.没有；缺乏
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talkv.谈话；交谈；说话；谈判；说服；议论；谈心；商讨；责备；彻底地讨论
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jackn.起重器；纸牌中的 “J”牌；插座；小白球；圆形的小鹅卵石；普通人；船首旗；钱；烤肉炙叉旋转器；琴键拨子；鲹；雄性动物；皮酒囊；(Jack）人名：杰克
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backn.背；背部；背面；反面；后面；卫；剑桥大学后园；背后；椅背；船体
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tankn.大容器；箱；罐；坦克；牢房；鱼缸；油箱；蓄水池
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trackn.小道；小径；铁路轨道；线路；足迹；踪迹；车辙；歌曲；音乐；轮距；赛道；跑道
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taskn.任务
"Middle English （in the general sense ‘something that fastens one thing to another’）： probably related to Old French
