noun

• (often in the plural) The flesh around the teeth.

verb

• (transitive) To deepen and enlarge the spaces between the teeth of (a worn saw), as with a gummer.

noun

• (botany, biochemistry, chiefly uncountable) A viscous water-soluble carbohydrate exudate of certain plants that hardens when it becomes dry, or such a substance as a component of a plant exudate.
  "gum arabic"
• (chiefly uncountable) Any viscous or sticky substance resembling the true gum.
  "gum benzoin"
• (chiefly uncountable) Chewing gum.
• (countable) A single piece of chewing gum.
  "Do you have a gum to spare?"

verb

• (sometimes with up) To apply an adhesive or gum to; to make sticky by applying a sticky substance to.
  "However, Albert said in his audiotape and in his speech that a lever designed to release the lifeboat's block and tackle was gummed up with red paint."
• (sometimes with together) To inelegantly attach into a sequence.
  "It consists in gumming together long strips of words [that] have already been set in order by someone else, and making the results presentable by sheer humbug."
• (colloquial, with up) To impair the functioning of a thing or process.
  "That cheap oil will gum up the engine valves."