arm and a leg
The loss of an arm and a leg would be a high price to pay for something.
- (idiomatic) A very high price for an item or service; an exorbitant price; usually used after the verb cost.
1954, me, “them”, in Commentary, volume 18, American Jewish Committee, page 448:
- That Polack costs me an arm and a leg, he thought.
1960 March 29, “Slim Waists Prompted New Sportswear Line”, in New York Times, page 44:
- Bangle bracelets in fourteen-karat gold that do not cost an arm and a leg are always in demand.
an exorbitant amount