An idiom is a figure of speech that means something
completely different than what the words or phrase actually state. For instance, “break a leg” means good
luck. What is meant by the saying “a
penny is a lot of money if you haven’t got one” is that more value is always
placed on what one doesn’t have. For
example, one will value water more if dying of thirst in the desert than one
who has plenty of drinking water to spare.
