better half noun

1. the person that you are married to, or your boyfriend or girlfriend

[TahlilGaran] English Dictionary ▲

better half
(someone's) better/other half
[old-fashioned]
someone's husband or wife or the person with whom they have a romantic relationship.
I should think 3.30 on Wednesday will be fine but I'd better check with my other half.

[TahlilGaran] English Idioms Dictionary ▲

better half
n., informal One's marriage partner (mostly said by men about their wives.)
"This is my better half, Mary," said Joe.

[TahlilGaran] English Idioms Dictionary ▲