more than friends - Wiktionary, the free dictionary

From Wiktionary, the free dictionary

more than friends pl (plural only)

1. Participants in a two-way relationship that is closer than a typical friendship, especially a romantic or marital relationship.

   • 2010, Neon Trees, Animal:

     Here we go again / I kinda wanna be more than friends / So take it easy on me / I'm afraid you're never satisfied