qióng​gēn​tàn​yuán

to get to the bottom of things

  1. to get to the bottom of things
    To investigate or probe deeply into the origin of a matter; bound form typically occurring in 穷根究底 qióng​gēn​jiū​dǐ or 穷根探源 qióng​gēn​tàn​yuán
  2. to find the source
    to exhaustively investigate in order to find the root cause of something; to trace something back to its origin