盤根問底 pán gēn wèn dǐ

DEFINITIONS

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

CHARACTERS

盤 pán tray, plate, dish; examine
根 gēn root, base(d on); foundation
問 wèn ask (about), inquire after
底 dǐ bottom, underneath, underside