一夫当关万夫莫开

一夫当关，万夫莫开:

Literally means:

if one man guards the pass, ten thousand are unable to get through

Actually means:

一夫, one man; Guan, a pass (that one has to go through); 当关, being on guard at the pass; Wan Fu, ten thousand men; 莫开, being unable to go through.

This phrase means that a pass is guarded by only one man, but it is insurmountable even to a great many people. It describes a strategic place that is easy to defend and hard to conquer. It also means that the defending force is very mighty. It is written expression. Commendatory.

一夫，一个人。关，关口（必须经过的地方）。当关，负责保卫关口。万夫，一万个人。莫开，不能打开。

一夫当关，万夫莫开，只要一个人守住，进攻的人再多也攻不进去。形容某个地势险要的地方，防守容易，进攻难。也形容防守人员的实力很强。书面语。具有褒义色彩。