Definition of gum up phrasal verb from the Oxford Advanced Learner's Dictionary

 

gum up

 phrasal verb
phrasal verb
 
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Phrasal Verbs
[usually passive] (informal) to cover or fill something with a sticky substance so that it stops moving or working as it should Open and close the valves occasionally so they don’t get gummed up.
See the Oxford Advanced American Dictionary entry: gum up

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