Learn English – Where does the phrase, “Costs an arm and a leg” come from

expressionsphrases

My understanding is that this goes back to George Washington's time when having one's portrait painted was very fashionable. However, artists did not like painting arms and legs because they often got the proportions wrong. So, they would give discounts on their fees if the sitter was prepared to hide one arm behind his back or cover a leg behind a piece of drapery. If you look at paintings from that period you will see many examples of the subject with his hand tucked into his waist coat or hidden behind something.
Sounds feasible to me.

Best Answer

The George Washington story and that of painters of his time who charged prices according to the number of limbs they were supposed to paint appears to be inconsistent. A more credible etymology is the following:

The expression “to cost an arm and a leg” is a metaphor about precious body parts. The similar line “I’d give my right arm…” dates from the early 1600s.

The phrase “an arm and a leg” rattled off the tongue easily before it was used to signify an exorbitant price. After the American Civil War, Congress enacted a special pension for soldiers who had lost both an arm and a leg. The phrase “cost an arm and a leg” begins to crop up in newspaper archives in 1901, referring to accidents and war injuries. In 1949, it shows up in the figurative sense.

The Long Beach Independent reported, "Food editor Beulah Karney has … ideas for the homemaker who wants to say 'Merry Christmas' and not have it cost an arm and a leg."

(mentalfloss.com)