A cuff link is a decorative fastener used to keep the two sides of a cuff together. It is used on a dress shirt or a blouse and worn both by men and women. They are put through the button holes and there are no buttons on the cuffs.
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: "A cuff link is a decorative fastener used to keep the two sides of a cuff together. It is used on a dress shirt or a blouse and worn both by men and women"
http://www.myjewelryplanet.com/jewelry/tiffany.html?browse=cuff_links