Take the time to practice this commonly used idiom!
An “arm and a leg” is mostly used in financial-related settings and situations, meaning something is very expensive.
Here is an example that shows how to use the expression properly.
A: “I really like your new handbag!”
B: “Thank you! I just bought it, even though it cost an arm and a leg.”
Here is one more example.
A: “Hey Brad, would you like to travel to Europe together?”
B: “Sure Alex, I would love to. I always wanted to go to Europe, but did not want to travel alone.”
A: “Awesome, I just hope the airline tickets and hotel reservations don’t cost an arm and a leg!”