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Verb. "Thou mutest the television"? Equinox◑ 21:37, 3 December 2010 (UTC)
It's a scanno for a staggering variety of words. I also found an actual use of "thou mutest", but it was "thou mutest among all the mute". — Beobach 21:59, 3 December 2010 (UTC)
Hard to cite, but not obviously wrong. "Mute" has lots of old meanings including "to murmur" and "to defecate (of a bird)", and in those senses there are plenty of usable citations for "muteth", so "mutest" must be valid (albeit I can't actually find any usage). Ƿidsiþ 12:49, 6 December 2010 (UTC)