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It occurred to me the other day that if ハ行転呼 had affected all applicable environments without exception, 母 /haha/ (or I guess properly it was /ɸaɸa/, right?)should have become /hawa/.

The Japanese wiki page for ハ行転呼 makes note of this and kind of handwaves it away by saying it's thought the relationship between 父/爺 and 母/婆 influenced 母 enough to keep its pronunciation from undergoing ハ行転呼, but there's no citation and it kinda just sounds to me like a "we have no clue" answer.


It does say 「一旦『はわ』に変化したのち」, so /haha/ (/ɸaɸa/?) did become /hawa/ before changing (back?) to /haha/. Is this maybe a case of spelling pronunciation or a conscious effort on (educated?) speakers' part to pronounce 母 in a deliberate, different way? I'm thinking like how some English speakers pronounce the "t" in often both because of its spelling and relationship to oft.

Since I couldn't find citations or sources, I guess my question is basically: Did 母 undergo ハ行転呼 and then change (back) to /haha/? Or was it an exception to the rule from the get-go?

(And now that I'm thinking about it, I wonder if there are dialects that pronounce it /hawa/, or if there were until relatively recently.)

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Did 母 undergo ハ行転呼 and then change (back) to /haha/?

Yes, it did become hawa (or rather ɸawa) before changing back. You may find citations here.

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