One of the mysteries of the English language finally explained.
A nail with a large sharp head, inserted into a horseshoe in place of a regular nail to provide extra traction in frosty conditions.
with object To equip (a horse) with horseshoes which are fitted with frost-nails. Also with the horse's rider as object. In later use usually in pass. Compare "frost".
Middle English. From frost + nail<br>late 16th century. From frost-nail. Compare earlier nail.
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