Someone once explained to me how to think about computer backups. She said “every night when you turn off your computer, just think what would happen with your data if the hard disk died and the computer simply wouldn’t start up again the next day”. Once...

This is an idiom. It has a special meaning that is different to the ordinary meaning of each separate word. It is used in several situations, but basically to wish luck to someone who is going to perform in a theater (some people believe that if...