An archaic or dialectal word meaning behind or at the rear of something.
From Old English 'a-' (at, in) combined with 'hind' (behind). This is another example of the Old English locational prefix system.
Words like 'ahind,' 'aback,' and 'ahead' show us that English used to use 'a-' as a positional prefix. 'Ahead' survived; 'ahind' didn't. It's basically linguistic natural selection—some variants thrived and others went extinct.
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