New answers tagged rendaku
There's two possible explanations here, and from a little bit of searching, it doesn't seem like anyone knows which is right (or that anyone's really thought much about it). Option 1: Rendaku plus metathesis (as Earthling suggested). te + tsutau > tedzutau > tetsudau. There might be another example of this happening with 舌鼓 - shita + tsutsumi > ...
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