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burn up

informal phrasal verb with burn
 
/bɜːn/
 
US  /bɝːn/ verb (burnt or burned, burnt or burned)

Definition

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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