What is the meaning of the phrase "copy that"? "Dr. Cooper, how can I help you? Yes, hello. I'm fine. Um... I understand you may have a bad impression of me, so I bought you a gift. Uh, Dr. Cooper, that's not necessary. It's too late. Get ready to like me. Roots? The tragic history of slavery in America. Fun for the whole family. Why would you think this is an appropriate gift? Um... Well... You are black, right? This meeting has come to an end. Because you want to start watching it right now. Copy that. Let's see." (The Big Bang Theory) Is it the same as understand? Does it work in British English?