The act or process of trimming, lining, or decorating garments with ermine fur, or the ermine material used in this process.
From 'ermine' with the gerund/present participle suffix '-ing,' creating a noun for the action of applying ermine fur to clothing; common in medieval and Renaissance tailoring vocabulary.
Medieval tailors had entire workshops dedicated to 'ermining' royal robes—it was a specialized, expensive skill that took years to master, and messing up on expensive ermine fur meant serious financial consequences.
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