婚

Left 女 is the indexing woman radical - a kneeling figure with folded arms. Anchors 婚 as a relationship-word centred on the bride. Reflects the ancient practice that defined marriage from the woman's side of the family. Same kinship-radical family: 妈 mother, 姐 elder sister, 嫁 to wed-out, 娶 to take-as-bride, 妻 wife.

Right 昏 supplies the sound hūn exactly and packs in the original meaning: ancient weddings were held at dusk (昏) when the groom went to fetch the bride. So 婚 reads literally as 'the woman-ceremony at twilight'. Sound-plus-semantic - not a pure phonetic loan. 昏 itself is 氏 lowering above 日 sun, picturing the sun dropping past the horizon.