gummed

To chew, especially of a toothless person or animal.

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

(sometimes with up) To apply an adhesive or gum to; to make sticky by applying a sticky substance to.

To stiffen with glue or gum.

(sometimes with together) To inelegantly attach into a sequence.

(with up) To impair the functioning of a thing or process.

“That cheap oil will gum up the engine valves.”