“De facto marriage” in Japanese
Short answer
De facto marriage in Japanese is “内縁” (naien). Full meaning: de facto marriage, common-law marriage.
Other ways to say “De facto marriage” in Japanese
事実婚
jijitsukon de facto marriage, common-law marriage
内縁関係
naienkankei de facto marriage, common-law marriage, living together as husband and wife without formal marriage
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