In a corner or at a corner; used in heraldry to describe something positioned at the corner of a shield.
From Old French 'a coin' meaning 'at the corner,' combining 'a' (to/at) with 'coin' (corner, from Latin 'cuneus' meaning wedge).
Medieval heraldry had specific language for every position on a shield, and 'acoin' is one of those forgotten technical terms that shows how precise and structured the rules of heraldic design were.
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