Tidy sum and Vast sum of money

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

Vast sum of money and tidy sum are semantically related. In some cases you can use "Vast sum of money" instead a noun phrase "Tidy sum".

Tidy sum and vast sum of money are semantically related. You can use "Tidy sum" instead a noun phrase "Vast sum of money".