"Didst a takeoff of" is a unique phrase that can be difficult to find synonyms for. However, if we break it down, "didst" can be replaced with more modern language such as "did" or "performed" or "executed". "Takeoff" can be substituted with "parodied", "mimicked", "spoofed" or "lampooned". Overall, we can say that a synonym for "didst a takeoff of" could be "performed a parody of", "executed a spoof of" or "mimicked and lampooned". The key is to understand the meaning behind the phrase and replacing it with words that convey the same message with modern language.