I used the phrase "open-and-shut" today, as in, "It's not an open-and-shut case", meaning that the item under discussion has not been decided and the outcome is not obvious.
I don't think I've ever heard the positive, only the negative. "It's not an open-and-shut case" seems to be the idiomatic way to use the phrase. I'm curious:
- What's the origin of "open-and-shut"?
- What's the origin of the idiomatic usage, "not an open-and-shut case"?