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Meaning of step-in

step-in

Pronunciation: (step'in"), [key]
— adj.
  1. (of garments, shoes, etc.) put on by being stepped into.
—n.
  1. panties, esp. bias-cut panties with wide legs worn by women in the 1920s and 1930s.
  2. any step-in garment.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.