1.. What's going on?: What's happening?
- It is very noisy in that room. What's going on?
- There are many police cars outside. What's going on?
2. to get a divorce: to legally end a marriage
- Mark and Sally got a divorce.
- She wants to get a divorce, but her husband doesn't want to.
3. to cheat on someone: to secretly be in a romantic relationship with a person who is not one's husband, wife, bfriend, or gfriend
- Tina and Mark got divorced because Tina was cheating on Mark.
- He cheats on his gfriend a lot when he travels on business.