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I'm interested in why the extra small tsu in included in the word デバッグ but not バグ.

Are there any rules governing voicing in words formed via reduplication?

Lyman's rule may explain this, but does anyone know any more information on why the triple voiced compound is resolved by adding a small tsu (like maybe why a long sound or something different isn't used)

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I'm fairly certain that this has to do with pitch in Japanese and accentuation in English.

The natural pitch for デバグ【HLL】 is HLL, whereas デバッグ【LHLL】 would naturally be LHL (and バグ【HL】 is HL). To mimic accentuation by pitch (i.e. accented syllables get a high pitch after transliteration), the ッ is necessary to give the バ a (natural) high pitch. バグ already has the right pitch pattern and the best pronunciation approximation to "bug".

(Besides, バッグ is already a word, although here the ッ is probably used to imitate the /æ/ sound, like in キャッシュ "cash".)

So both バグ and デバッグ are to be the expected transliterations, and either pair バッグ/デバッグ and バグ/デバグ has shortcomings, albeit being more consistent in some sense.

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    This is probably the correct answer. Japanese loanwords also use long vowels to indicate a downstep in the middle of the long vowel, often to imitate English diphthongs where half of the diphthong is stressed. – ithisa Nov 19 '13 at 14:09
  • @user54609 Could you give an example for "Japanese loanwords [that] also use long vowels to indicate a downstep in the middle of the long vowel, often to imitate English diphthongs where half of the diphthong is stressed"? – Earthliŋ♦ Nov 19 '13 at 16:15
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    アニメーション /a.ni.meꜜ.e.sjon/ – ithisa Nov 19 '13 at 20:50
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    I'v never realized this but now many katakana versions of peoples names make much more sense to me now. Especially if you consider the different transcription versions of the original name in French, German or English for example. Great question and answer – user11382889 Aug 23 '19 at 9:33
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I do not know for sure but suppose that it is highly related to the original word that was used.

In case of デバッグ this easily may be debugging, not the debug. And then formal transliteration was contracted even shorter. We know many examples like colloquial バイト which is a contraction of アルバイト.

Of course this is only a theory and more detailed answer is highly appreciated.

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    interesting to note, though, that the wikipedia page for バグ refers to a buggy program as "バギー・プログラム," and I'd assume that it would be transliterated the same way as debugging. I wonder if it's just an irregularity? – ssb Nov 19 '13 at 4:23
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    I think most Japanese programmers don't use the phrase "バギー・プログラム". – user4688 Apr 16 '14 at 9:24

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