pay a kings ransom

The phrase to pay a kings ransom which to be paying a very large amount of money for something as a kings ransom is often known as a lot of money. This phrase refers to a King being held by an opposing kingdom or group of people for a large amount of money in which his own kingdom must pay before they get him back. When used figuratively. Paying a kings ransom can be related to any situation where you have to pay a lot of money.