The spelling of the word "thus thus" is straightforward when using IPA phonetic transcription. The first syllable, "thus," is pronounced with a voiced "th" sound /ð/, followed by a short "uh" vowel sound /ʌ/. The second syllable, also "thus," is pronounced with the same voiced "th" sound /ð/, followed by a short "oo" vowel sound /ʊ/. This word is commonly used in academic or professional writing to express a conclusion or follow-on idea.
The word "thus thus" does not have a specific etymology because it is not a standalone word or term in English. The word "thus" originated from the Middle English "thus" or "thusse", which came from the Old English "þus" meaning "in this manner" or "in this wise". However, "thus thus" seems to be a repetition or duplication, which may not have a specific etymology itself.