The phrase "call back" is a verb that has a few different meanings, but generally, it involves the idea of returning to a previous state or position, or making a return phone call. Let's break it down for you:
To Summon to Return: This means to ask someone to return to a place. For example, if someone is recalled to their country, it means they have been asked to come back home.
To Return a Phone Call: This is when someone asks you to call them again later, or you return a call you missed.
To Recall Knowledge from Memory: This meaning relates to remembering something.
To Cause to be Returned: This can refer to a situation where something is recalled, like a product that has a defect.
In professional settings, you might hear "call back" used in the context of hiring or job applications, where a company may "call back" candidates for further interviews.