1
general::
1. Be mutually suitable, appropriate, or harmonious, as in Pink and purple can go together well, or I don't think champagne and meatloaf go together. [c. 1600] 2. Date on a regular basis, keep company. For example, Are Bill and Ann still going together? [Late 1800s] Also see GO STEADY; GO WITH.
American Heritage Idioms
2
general::
Phrase(s): go together
1. Lit. [for two or more things] to look, sound, or taste good together. • Do you think that this pink one and this purple one go together? • Milk and grapefruit don’t go together. 2. Fig. [for two people] to date each other regularly. • Bob and Ann have been going together for months. • Tom and Jane want to go together, but they live too far apart.
McGrawhill's American Idioms And Phrasal Verbs