一夫 jat¹ fu¹ {yī fū}

One husband

一夫當關〔--当关〕 jat¹ fu¹ dong¹ gwaan¹ {yī fū dāng guān}

lit. one man guarding the gateway, meaning one who is courageous and can fend off any troubles

一夫多妻 jat¹ fu¹ do¹ cai¹ {yī fū duō qī}

polygamy

一夫一妻 jat¹ fu¹ jat¹ cai¹ {yī fū yī qī}

1. lit. one husband one wife
2. monogamy

一夫一妻制 jat¹ fu¹ jat¹ cai¹ zai³ {yī fū yī qī zhì}

Monogamy

一夫當關，萬夫莫開〔--当关-万--开〕 jat¹ fu¹ dong¹ gwaan¹ ，maan⁶ fu¹ mok⁶ hoi¹ {yī fū dāng guān , wàn fū mò kāi}

one man can hold the pass against ten thousand enemies (idiom)