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English definition of “gum sth up”

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gum sth up

verb [T] uk phrasal verb with gum   /ɡʌm/ (-mm-) old-fashioned us  
to prevent something from working or opening in the usual way by covering it with a sticky substance: When I woke up this morning my eyes were all gummed up.
(Definition of gum sth up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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