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gum

2 verb
     
gum2 past tense and past participle gummed, present participle gumming [transitive always + adverb/preposition]
British English old-fashioned to stick things together using glue [= glue]
gum something to something
A large label had been gummed to the back of the photograph.

gum something ↔ up

phrasal verb
to prevent a machine from moving and working properly:
Dirt had got inside the watch and gummed up the works.

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