go to ground

/G OW1 T UW0 G R AW0 N D/
verb
  1. 1

    (especially of an animal) To escape into a burrow, hole, etc. when being hunted.

  2. 2

    (by extension) To hide from public view or sequester oneself, especially when authorities, members of the news media, or others are looking for one.

  3. 3

    To fall on the floor

Source: https://en.wiktionary.org/wiki/go%20to%20ground