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English definition of “burn up”

burn up

informal phrasal verb with burn     /bɜːn/ US  /bɝːn/ verb (burnt or burned, burnt or burned)
to have a bad fever : "You're burning up!" she said, touching his forehead .Fevers and infectious diseasesColds and flu
(Definition of burn up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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