询根问底 xún gēn wèn dǐ

DEFINITIONS

  1. lit. to examine roots and inquire at the base (idiom); to get to the bottom of sth

CHARACTERS

询 xún inquire into, ask about; consult
根 gēn root, base(d on); foundation
问 wèn ask about, inquire after
底 dǐ bottom, underneath, underside