Definition of burn up phrasal verb from the Oxford Advanced Learner's Dictionary

 

burn up

 phrasal verb
phrasal verb
 
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Phrasal Verbs
  1. 1to be destroyed by heat The spacecraft burned up as it entered the earth's atmosphere.
  2. 2(usually used in the progressive tenses) (informal) to have a high temperature You're burning up—have you seen a doctor?
  3. 3(of a fire) to burn more strongly and with larger flames
(North American English, informal) to make somebody very angry The way he treats me really burns me up.
  1. 1to get rid of or destroy something by burning The fire burned up 1 500 acres of farmland.
  2. 2to use calories or energy by doing exercise Which burns up more calories—swimming or cycling?
See the Oxford Advanced American Dictionary entry: burn up