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Wiktionary
burn down

vb. 1 (context transitive English) To cause (a structure) to burn to nothing. 2 (context intransitive of a structure English) To burn completely, so that nothing remains.

WordNet
burn down
  1. v. burn completely; be consumed or destroyed by fire; "The hut burned down"; "The mountain of paper went up in flames" [syn: burn up, go up]

  2. destroy by fire; "They burned the house and his diaries" [syn: burn, fire]

Usage examples of "burn down".

They get so paranoid that in order to protect their island, they burn down the bridge.