The word "tach tache" is a bit of a mystery when it comes to spelling. The pronunciation is typically transcribed as /tæk tæʃ/, with the first syllable sounding like "tack" and the second sounding like "tash." However, the actual spelling of the word is not clear, as there are a variety of possible combinations of letters that could represent these sounds. Some possible spellings might include "tac tash," "tack tache," or even "tac-tache." Without more context, it's difficult to determine the best spelling for this word.