An obsolete or extremely rare dialectal term, possibly meaning to wash away or to wilt; its exact meaning is uncertain.
The etymology is unclear, but it may combine ad- (to) + wesch or wash (from Old English wascan, to wash). The word is so rare that it appears only in historical glossaries and may be a scribal error or regional dialect.
Adwesch is so obscure that even the Oxford English Dictionary marks it with uncertainty—it's a linguistic ghost, mentioned just enough to know it existed but not enough to know what it really meant.
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