一：a，one，less of
夫： enlisted men，soldiers
当：blocking，hold a post;
关：the fort，mountain pass
万：ten thousand，a massive number of
莫：not ，can‘t，don't，
开：through ，sally, open，break
一夫当关，万夫莫开。
It means a place in war where it is easy to hold but hard to attack and occupy.
Another informal expression is that a man is too powerful to defeat him. this wrong use, but it might be helpful for you to grasp that idiom.
一：a，one，less of夫： enlisted men，soldiers当：blocking，hold a post;关：the fort，mountain pass万：ten thousand，a massive number of莫：not ，can‘t，don't，开：through ，sally, open，break一夫当关，万夫莫开。It means a place in war where it is easy to hold but hard to attack and occupy.Another informal expression is that a man is too powerful to defeat him. this wrong use, but it might be helpful for you to grasp that idiom.
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