A conjecture about the double eth: OE had no letters v, z, or eth as distinguished from thorn. The sounds existed, but not as phonemes; rather, they were allophones of f, s, and thorn. *Sithan with a single thorn would voice the thorn (eth sensu strictu); it seems to me that siththan with double thorn would be pronounced with unvoiced thorn (thorn sensu strictu). Stephen
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