“this rare treasure cost me an arm and a leg”what does this mean

a rare treasure is something super old or not common and cost an arm and a leg means it cost them a lot of money

Explanation:

Hope this helps

the phrase cost me an arm and a leg means..

Explanation:

that the item they got was really expensive...!

it's called a epic poem i believe, hope this ☺

its he tried to add or forgive me but he said forego