noun, verb, knot⋅ted, knot⋅ting.| 1. | an interlacing, twining, looping, etc., of a cord, rope, or the like, drawn tight into a knob or lump, for fastening, binding, or connecting two cords together or a cord to something else. |
| 2. | a piece of ribbon or similar material tied or folded upon itself and used or worn as an ornament. |
| 3. | a group or cluster of persons or things: a knot of spectators. |
| 4. | the hard, cross-grained mass of wood at the place where a branch joins the trunk of a tree. |
| 5. | a part of this mass showing in a piece of lumber, wood panel, etc. |
| 6. | Anatomy, Zoology. a protuberance or swelling on or in a part or process, as in a muscle. |
| 7. | a protuberance in the tissue of a plant; an excrescence on a stem, branch, or root; a node or joint in a stem, esp. when of swollen form. |
| 8. | any of various fungal diseases of trees characterized by the formation of an excrescence, knob, or gnarl. |
| 9. | an involved, intricate, or difficult matter; complicated problem. |
| 10. | Nautical.
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| 11. | a bond or tie: the knot of matrimony. |
| 12. | Also called joint, node. Mathematics. in interpolation, one of the points at which the values of a function are assigned. |
| 13. | to tie in a knot; form a knot in. |
| 14. | to secure or fasten by a knot. |
| 15. | to form protuberances, bosses, or knobs in; make knotty. |
| 16. | to become tied or tangled in a knot. |
| 17. | to form knots or joints. |
| 18. | tie the knot, Informal. to marry: They will tie the knot in November. |

tie the knot
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"The distance between the knots on the log-line should contain 1/120 of a mile, supposing the glass to run exactly half a minute." [Jorge Juan and Antonio de Ulloa, "A Voyage to South America" 1760]The verb meaning "to tie in a knot" is from 1547. Knot-hole is from 1726. Knothead "stupid person" is from 1940.
knot (nŏt)
n.
A compact intersection of interlaced material, as of cord, ribbon, or rope.
A protuberant growth or swelling in a tissue, such as a gland.
tie the knot
Get married; also, perform a marriage ceremony. For example, So when are you two going to tie the knot? or They asked their friend, who is a judge, to tie the knot. [Early 1700s]