To yield; to give way or surrender—an archaic form with the 'a-' prefix.
From 'a-' (prefix) plus 'yield' (to give way), following the pattern of archaic verb formation where prefixes were added to create emphatic or aspectual meanings.
The 'a-' prefix in 'ayield' shows how prefixes can completely change a word's feel—'a-yield' sounds more dramatic and final than just 'yield.'
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