The spelling of the word "didst uturn" is not a common one. However, it can be phonetically explained using the International Phonetic Alphabet. "Didst" is pronounced as /dɪdst/ and means "did." "Uturn" is pronounced as /juːtɜːrn/ and means a quick turn made by a vehicle. Therefore, "didst uturn" can be interpreted as a command to make a sudden turn. While this spelling may not be widely recognized, its meaning can be understood through phonetic interpretation.