tack

中文： 图钉、平头小钉、粗缝

1. A small nail with a flat head. (countable, uncountable)
2. A thumbtack. (countable, uncountable)
3. A loose seam used to temporarily fasten pieces of cloth. (countable, uncountable)
4. The lower corner on the leading edge of a sail relative to the direction of the wind. (countable, uncountable)
5. A course or heading that enables a sailing vessel to head upwind. (countable, uncountable)
6. A direction or course of action, especially a new one; a method or approach to solving a problem. (countable, figuratively, uncountable)
7. The maneuver by which a sailing vessel turns its bow through the wind so that the wind changes from one side to the other. (countable, uncountable)
8. The distance a sailing vessel runs between these maneuvers when working to windward; a board. (countable, uncountable)

复数 tacks