盤ㄆㄢˊ根ㄍㄣ問ㄨㄣˋ底ㄉㄧˇpángēn‑wèndǐ

简盘根问底

  1. 盤查根源，詢問底細。例 「對應徵人員盤根問底是必要的工作」。

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