"Carriage return"--think about the term for a moment, then try to explain this idiomatic expression to a non-English speaker who is under the age of about 25. (Yes, I know what it means, I'm a touch typist from the days when you had to return your own carriage with that hand thingie, there wasn't even a button where the "enter" button is now to do it for you, before word wrap took that function away from the "enter" formerly "return" button. . .)