Verb burn down has 2 senses
  1. burn down, burn up, go up - burn completely; be consumed or destroyed by fire; "The hut burned down"; "The mountain of paper went up in flames"
    --1 is one way to burn, combust
    Sample sentence:
    Something ----s
  2. burn, fire, burn down - destroy by fire; "They burned the house and his diaries"
    --2 is one way to destroy, ruin
    Sample sentence:
    They burn down the trees
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