,| 1. | a short, sharp-pointed nail, usually with a flat, broad head. |
| 2. | Nautical.
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| 3. | a course of action or conduct, esp. one differing from some preceding or other course. |
| 4. | one of the movements of a zigzag course on land. |
| 5. | a stitch, esp. a long stitch used in fastening seams, preparatory to a more thorough sewing. |
| 6. | a fastening, esp. of a temporary kind. |
| 7. | stickiness, as of nearly dry paint or glue or of a printing ink or gummed tape; adhesiveness. |
| 8. | the gear used in equipping a horse, including saddle, bridle, martingale, etc. |
| 9. | to fasten by a tack or tacks: to tack a rug to the floor. |
| 10. | to secure by some slight or temporary fastening. |
| 11. | to join together; unite; combine. |
| 12. | to attach as something supplementary; append; annex (often fol. by on or onto). |
| 13. | Nautical.
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| 14. | to equip (a horse) with tack. |
| 15. | Nautical.
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| 16. | to take or follow a zigzag course or route. |
| 17. | to change one's course of action, conduct, ideas, etc. |
| 18. | to equip a horse with tack (usually fol. by up): Please tack up quickly. |
| 19. | on the wrong tack, under a misapprehension; in error; astray: His line of questioning began on the wrong tack. |