Keep back and Set aside

Keep back verb - Keep under control; keep in check.

Set aside is a synonym for keep back in keep topic. In some cases you can use "Set aside" instead a verb "Keep back", when it comes to topics like reserve, save.

Set aside verb - Give or assign a resource to a particular person or cause.

Keep back is a synonym for set aside in keep topic. You can use "Keep back" instead a verb "Set aside", if it concerns topics such as reserve, save.