Well, you know that when you are born you are whats called naked. Then you have things put on you - these are called clothes. Now, after you have had the `clothes` on for a while, they get soiled i.e. dirty, and smelly (especially if you live in Yorkshire and smoke, take your whippet to bed with you after drinking 15 pints of Parsons Bum Beer after a hard day down the mine.
Now, the clothes are taken off you and put in stuff called `Water` which makes them wet. So, they are then hung on a line in the garden till they are dry.
SO - They are " Hung out to Dry" is that clear?