(someone's) better half

Translations
вторая половина (кто-то)
John's better half is very supportive of his career.
Вторая половина Джона очень поддерживает его карьеру.
Definitions
A term used to refer to someone's spouse, partner, or significant other, often implying that the person is the more admirable, sensible, or important member of the couple.