The spelling of the word "doeth turn" is reflective of Old English pronunciation, in which the "th" sound was pronounced differently than it is today. In IPA transcription, "doeth" would be transcribed as /dʌθ/, with a voiced dental fricative "th" sound, while "turn" would be transcribed as /tʌrn/ with an unvoiced dental fricative "th" sound. The use of these different sounds allowed for a clear distinction between the two words, which would have been important for communication in Old English.
The phrase "doeth turn" seems to be a combination of words from Middle English and Early Modern English.
The word "doeth" is an archaic form of the third-person singular present indicative of the verb "do". In Middle English, it was "doth" and in Early Modern English, it evolved to "doeth". It was commonly used to indicate actions or obligations performed by someone.
The word "turn" has its roots in Old English, where it was "turnian" meaning "to rotate" or "to revolve". Over time, it evolved into "turn" in Middle English with a similar meaning.
When these words are put together, "doeth turn" would mean "does turn" or "performs a turning action". However, it's worth noting that this combination is not particularly common in contemporary English usage.