0 to look good together: --
1 to happen or be found together: --
Researchers have discovered that short-sightedness and high IQs seem to go together in children.
Wisdom and maturity don't necessarily go together.
2 If two people are going together, they have a romantic or sexual relationship with each other. --
3 to regularly exist at the same time, or often be found in the same place: --
The new extension goes together with the rest of the building.
I think red and orange go together, though lots of people think they clash.