Is "take" used frequently as the meaning of "believe" or "think"?

What does “you got it” really mean here?

"You got it" in this context means "let's do it". Ex: A: Will you eat lunch with me this Saturday? B: You got it.

What does "moral imperative" mean?

A moral imperative is a strongly-felt principle that compels a person to act in a way that they think is (morally) right or just. For example, when you see someone whose money is being stolen but they are unaware of it. Ex: I have a moral imperative to help those less fortunate than myself. Ex: Sometimes, your moral imperative will be in conflict with your instinct for self-protection.

In what situation is “itself" used which is coming right after the subject?

"Itself" right after the subject is used to emphasize the subject mentioned. Saying "Amazon itself.." is showing emphasis towards what Amazon is doing. If the word "itself" is not directly after the subject, it is used to refer to a thing or animal previously mentioned in the sentence. Here are some example sentences of "itself" being used directly after the subject. Ex: The tree itself grew tall and strong. Ex: The company itself is doing very well. Here are some example sentences of "itself" being used later in the sentence. Ex: The dog injured itself while running. Ex: The furniture is beautiful by itself.

What's "call on" mean?

Here, "call on" means to make use of someone or something for help. "Call on" can also mean visiting someone to spend some time with them, usually not for more than a day. Ex: My brother said to call on him if I need help with the bank. Ex: Jane's going to call on Maria today. => to visit Ex: I told my team they can call on me if they need anything.

What's "we're off" mean and when's it used?

"We're off" means we are going. So if you and maybe some other people are going somewhere, when you start moving in the vehicle, by foot, or another mode of transport, you can say, "we're off". Or, if you're leaving a place and want to let people know that you're going right now, then you can "we're off!" Ex: Alright, we're off to see the dentist. Ex: The race is about to begin... and they're off! Hamilton moves swiftly around the corner. => motorsports commentary Ex: We're off. Please remain seated with you seat belts fastened for the beginning of the flight.