[鸿沟 / 鴻溝, hóng gōuㄏㄨㄥˊ ㄍㄡ] wide gap; gulf; chasm; lit. name of old canal in Henan that formed the border between enemies Chu 楚 and Han 漢|汉, See Also: 楚, 漢, 汉#26357
[四面楚歌, sì miàn chǔ gēㄙˋ ㄇㄧㄢˋ ㄔㄨˇ ㄍㄜ] lit. on all sides the songs of Chu (成语 saw); fig. surrounded by enemies, isolated and without help (refers to the desperate final hours of Xiangyu 項羽|项羽); lone dissenting voice, See Also: 成语, 項羽, 项羽#51822
[一夫当关,万夫莫开 / 一夫當關,萬夫莫開, yī fū dāng guān, wàn fū mò kāiㄧ ㄈㄨ ㄉㄤ ㄍㄨㄢ, ㄨㄢˋ ㄈㄨ ㄇㄛˋ ㄎㄞ] If one man holds the pass, ten thousand cannot pass (成语 saw); One man can hold the pass against ten thousand enemies