hang together

Short definition from Wiktionary

Verb

1. 1
   To be connected.
2. 2
   To correspond or fit well.
3. 3
   To be in a romantic relationship.
4. 4
   To be united in defiance.
5. 5
   To remain united; to stand by one another.
6. 6
   To be self-consistent and make sense; to seem plausible.