ㄏㄨㄥˊhóngㄍㄡgōu

  1. 河川河南省滎陽縣楚漢分界

  2. 比喻界限分明判若鴻溝」。

(fig.)​ gulf, chasm, wide gap, (originally)​ the Hong Canal in Henan, which in ancient times formed the border between enemies Chu 楚 and Han 漢
fossé profond
Kluft (S)​