From Longman Dictionary of Contemporary Englishburn up phrasal verb1 DESTROYBURNif something burns up or is burnt up, it is completely destroyed by fire or heat The satellite will burn up as it re-enters the Earth’s atmosphere.burn something ↔ up Most of the woodland has now been burnt up.2 burn something ↔ up informal to use a lot of something in a careless way Most household appliances burn up loads of electricity. He just burns up money!3 BE HOT be burning up spokenHOT if someone is burning up, they are very hot, usually because they are ill Feel his forehead – he’s burning up.4 MAKE somebody ANGRY burn somebody upANGRY American English informal to make someone very angry The way he treats her really burns me up.5 EXERCISE burn something ↔ up to use energy that is stored in your body, by being physically active As we get older, our body becomes less efficient at burning up calories. → burn→ See Verb table
Examples from the Corpus
burn up• Women tend to burn up calories less efficiently than men.• In the typical Western diet, all the energy in protein is burned up daily.be burning up• Think about the calories you are burning up - 200 for every 30 minute walk!• Although it was cold and the air was running out, she was burning up.• In these circumstances, it should be roughly assumed that you would be burning up around 2,000 calories a day.• In the on-line world, customers were burning up the lines. 