other half

plural other halves

1. idiomaticA spouse or a significant other.

   It depends on what my other half says.

   2 more examples

   Near-synonyms: better half (positive valence), ball and chain (negative valence)

   Oh, I'm still missing my other half / Oh, it must be something I did in the past

   1972, Lou Reed, “Goodnight Ladies”, in Transformer

   Synonyms: better half, ball and chain

2. idiomaticThe wealthy; the very wealthy.

   how the other half lives

   Antonyms: 99 percent

3. Used other than figuratively or idiomatically: see other, half.