your significant other

significant other

A person with whom one is in a serious romantic relationship. Primarily heard in US. Since Kelly didn't have a significant other, she attended her friend's wedding alone.
See also: other, significant
Farlex Dictionary of Idioms.

your significant other

A person's significant other is their wife, husband, or the person they are having a relationship with. Poor Holly, she hadn't any significant other to bring with her. Well, we always work together, we live together — he's my significant other.
See also: other, significant
Collins COBUILD Idioms Dictionary, 3rd ed.
See also:
  • significant
  • significant other
  • ship name
  • moonlight and roses
  • love's young dream
  • moonlight
  • be (not) all moonlight and roses
  • candy
  • arm candy
  • FBO
References in periodicals archive
Let me check with your significant others. What will they say?
* Have you had conflicts with your significant others because of handball?