betterhalf
nounUK /ˌbetəˈhɑːf/
US /ˌbetərˈhæf/
The person you love and live with, like a husband or wife.
He always says his better half is the one who makes him laugh.
OTHER MEANINGS
2. A close friend who makes you a better person.
My best friend is my better half when it comes to staying positive.
3. The stronger or more skilled part of a team or pair.
In their doubles team, she is clearly the better half.
4. A person who balances or completes another person.
My sister is the calm one—she's my better half in every adventure.