a king's ransom

a large amount of money A visit to one of those amusement parks can cost a king's ransom.

Usage notes: often used with worth or cost, as in the example

a very large amount of money (not used with the ) She was wearing a diamond necklace which must have been worth a king's ransom.

Name	Pronounced	Usage
Conn	-	Irish
Vicki	['viki]
Jessie (1)	JES-ee	Scottish, English
Eleonoora	E-le-o-no:-rah	Finnish (Rare)
Thaddaios	-	Biblical Greek
Fidela	-	Spanish