Set-back and Tidy sum

Set-back noun - Structure where a wall or building narrows abruptly.

Tidy sum and set-back are semantically related in total topic. In some cases you can use "Tidy sum" instead a noun phrase "Set-back".

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

Set-back and tidy sum are semantically related in total topic. Sometimes you can use "Set-back" instead a noun phrase "Tidy sum".