The spelling of the word "didst takeoff of" may appear confusing at first sight, but it can be broken down phonetically. "Didst" is pronounced as /dɪdst/, and "takeoff" as /teɪkɒf/. The final "of" is pronounced as /ɒv/, which is a shortening of the word "off." Therefore, the correct spelling of this phrase is "didst takeoff of" not "didst take off of." It is essential to pay attention to the combination of sounds and syllables in words to avoid spelling errors.