burn down

/B ER1 N D AW1 N/
verb
  1. 1

    To cause (a structure) to burn to nothing.

    โ€œThe police are hoping to find the people who burned down the cottage.โ€

  2. 2

    (of a structure) To burn completely, so that nothing remains.

    โ€œA fire which started in the bedroom caused the cottage to burn down.โ€

Source: https://en.wiktionary.org/wiki/burn%20down