Definitions
1.verbTo chew, especially of a toothless person or animal.
2.verbTo deepen and enlarge the spaces between the teeth of (a worn saw), as with a gummer.
3.verb(sometimes with up) To apply an adhesive or gum to; to make sticky by applying a sticky substance to.
4.verbTo stiffen with glue or gum.
5.verb(sometimes with together) To inelegantly attach into a sequence.
6.verb(with up) To impair the functioning of a thing or process."That cheap oil will gum up the engine valves."