noun, verb, gummed, gum⋅ming.| 1. | any of various viscid, amorphous exudations from plants, hardening on exposure to air and soluble in or forming a viscid mass with water. |
| 2. | any of various similar exudations, as resin. |
| 3. | a preparation of such a substance, as for use in the arts or bookbinding. |
| 4. | chewing gum. |
| 5. | mucilage; glue. |
| 6. | rubber 1 (def. 1). |
| 7. | gum tree. |
| 8. | Philately. the adhesive by which a postage stamp is affixed. Compare o.g. (def. 1). |
| 9. | Informal. a rubber overshoe or boot. |
| 10. | to smear, stiffen, or stick together with gum. |
| 11. | to clog with or as if with some gummy substance. |
| 12. | to exude or form gum. |
| 13. | to become gummy. |
| 14. | to become clogged with a gummy substance. |
| 15. | gum up, Slang. to spoil or ruin. |
| 16. | gum up the works. work (def. 50). |

gum 2
n.
The firm connective tissue covered by mucous membrane that envelops the alveolar arches of the jaw and surrounds the bases of the teeth. Also called gingiva. v. gummed, gum·ming, gums
To chew food with toothless gums.
gum up
Ruin or bungle something, as in The front office has gummed up the sales campaign thoroughly. This idiom is also put as gum up the works, as in John's changes in procedures have gummed up the works in the shipping department. [Slang; c. 1900]