Definition of burn down phrasal verb from the Oxford Advanced American Dictionary

  

burn down

 phrasal verb
phrasal verb
 
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Phrasal Verbs
if a fire burns down, it becomes weaker and has smaller flames

burn down

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burn somethingdown

 
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 to be destroyed, or to destroy something, by fire The house burned down in 1895.
See the Oxford Advanced Learner's Dictionary entry: burn down