[step-in] n (1921): an article of clothing put on by being stepped into: as a: a shoe resembling but usu. having a higher vamp than a pump and concealed elastic to adjust the fit b: short panties for women--usu. used in pl. -- step-in adj
STEP-IN
Meaning of STEP-IN in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012