One of the mysteries of the English language finally explained.
Having perforations or holes, pierced; specifically designating an ornamental openwork pattern on metalwork, leather work, etc., or the technique by which it is produced. Often used postpositively. Also as adverb: in this manner, so as to have such piercings or openwork.
Mid 16th century. From Middle French, French à jour, lit. ‘(open) to the daylight’, from à to + jour.
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