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English definition of “gum”

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gum

noun uk   /ɡʌm/ us  

gum noun (MOUTH)

B2 [C] either of the two areas of firm pink flesh inside the mouth that cover the bones into which the teeth are fixed: sore gums

gum noun (STICKY SUBSTANCE)

[U] a sticky substance that comes from the stems of some trees and plants [U] a type of glue used for sticking together pieces of paper [U] chewing gum or bubble gum (= a soft sweet that you crush with your teeth but do not swallow) [C] UK used in the names of some chewy sweets with fruit flavours: fruit/wine gums
Idioms

gum

verb [T] uk   /ɡʌm/ (-mm-) old-fashioned us  
If you gum one piece of paper to another, you stick them together using glue: The labels were already gummed to the envelopes.
Phrasal verbs
(Definition of gum from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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