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Definition of Gum up
1. Verb. Stick together as if with gum. "The inside of the pipe has gummed up"
Definition of Gum up
1. Verb. (transitive) To cause to be gooey or gummy, especially with the effect of obstructing the operation of some mechanism or process. ¹
2. Verb. (transitive idiomatic by extension) To make non-functional; to interfere with or put into a state of disorder; to ruin. ¹
¹ Source: wiktionary.com