An archaic term meaning to give a body to, to embody, to make physical, or to put into bodily form.
From a- (prefix meaning 'to') + body (noun). This is a rare formation using the Old English prefix a- attached to a noun to create a verb, a pattern more common in Middle English.
Abody is a ghost of a grammatical system—in Middle English, you could take almost any noun and add 'a-' to make a verb ('aboard,' 'afoot,' 'ablaze'), but almost all have vanished, leaving abody as a linguistic relic.
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