一夫当关，万夫莫开
yī​fū​dāng​guān​wàn​fū​mò​kāi

impregnable

  1. 一夫当关 一夫當關 yī​fū​dāng​guān
    to defend a strategic pass
    (idiom) a single person guards the pass; used to describe a position that is easy to defend and difficult to attack, or a defender who is exceptionally brave
  2. ， wàn
    non-Chinese
  3. 万 萬 wàn numeral
    ten thousand
    the number 10,000
  4. 夫 fū noun
    man
    man; adult male; also used to refer to people in general
  5. 莫 mò adjective
    none
    (literary) nothing; no one; there is none who
  6. 开 開 kāi verbparticle
    to open
    to open; to unfold; to unseal; (of flowers) to bloom; to carve or cut open