To descend, fall down, collapse.
- A tree came down and hit me on the head.
- After a clap of thunder, down came the rain.
- Down you come this moment, you rapscallion!
To be demolished.
- The damage sustained in the fire is so great that the whole building will have to come down.
To decrease.
- Real estate prices have come down since the peak of the boom.
To reach or release a decision.
- I can't guess which way the board will come down on the project.
- The decision in Doe v. Smith came down this morning.
To be passed through time.
- Much wisdom has come down in the form of proverbs.
To return from an elevated state of consciousness (especially when drug-induced) or emotion.
- He finally came down from his post-bonus high.
To rain.
- It's coming down heavily now.
To graduate from university, especially an Oxbridge university.
Shortening of of come down the (pike, line, etc.) To be about to happen; to occur; to transpire.
To behave in a particular way.
- He's been coming down angry all day.