expression, noun
de facto husband; common-law husband
Legal and social term for a man who lives with a woman in a marriage-like relationship without formal registration. Often contrasted with 内縁の妻 (common-law wife).
See also: 内縁の妻 (ないえんのつま)
彼は内縁の夫として、彼女と10年以上一緒に暮らしている。
He has been living with her for over ten years as her common-law husband.