听之任之
tīng​zhī​rèn​zhī

to let things take their course

  1. 听 聽 tīng
    to let
    to let; to allow; to permit someone to do as they please
  2. 之 zhī pronoun
    it
    Used only in the object position to refer to a person or thing already mentioned, meaning "him", "her", "it", or "them".
  3. 任 rèn verbadjective
    to allow
    To let something happen, to give free rein to, or to listen to someone's whim.
  4. 之 zhī pronoun
    it
    Used only in the object position to refer to a person or thing already mentioned, meaning "him", "her", "it", or "them".