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"sinuous and slender," of women or clothes, 1921, from slink + -y (2). Related: Slinkily; slinkiness. As a proprietary name (with capital from S-) for a coil of spring marketed as a toy, 1948, by James Industries Inc., Philadelphia, U.S.A.
Sinuous and sexy: one of those slinky glittering females (1921+)