Arm and a leg and Tidy sum

Tidy sum and arm and a leg are semantically related. in lot of money topic. In some cases you can use "Tidy sum" instead a noun phrase "Arm and a leg".

Tidy sum noun - (often followed by `of') a large number or amount or extent.

Arm and a leg and tidy sum are semantically related. Sometimes you can use "Arm and a leg" instead a noun phrase "Tidy sum".