a woman's small ornamental pin, usually worn with other similar pins on a dress, suit jacket, etc.
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British Dictionary definitions for scatter pin
a small decorative pin usually worn in groups of two or three
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012