Set-back and Slow down

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

Slow down and set-back are semantically related. In some cases you can use "Slow down" instead a verb phrase "Set-back".

Slow down verb - Lose velocity; move more slowly.

Set-back and slow down are semantically related. Sometimes you can replace phrase "Set-back" with "Slow down", this terms are similar.