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• step-in
  step-in

  adjective

  (of garments, shoes, etc.) put on by being stepped into.
• step in
  step in

  verb

  (intr, adverb) to intervene or involve oneself, esp dramatically or at a senior level

step-in

American  

[step-in] / ˈstɛpˌɪn /

adjective

1. (of garments, shoes, etc.) put on by being stepped into.

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noun

1. step-ins, panties, especially bias-cut panties with wide legs worn by women in the 1920s and 1930s.

2. any step-in garment.

step in British  

verb

1. informal (intr, adverb) to intervene or involve oneself, esp dramatically or at a senior level

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adjective

1. (prenominal) (of garments, etc) put on by being stepped into; without fastenings

2. (of a ski binding) engaging automatically when the boot is positioned on the ski

noun

1. (often plural) a step-in garment, esp underwear

step in Idioms  

1. Enter into an activity or situation; also, intervene. For example, The business was doing poorly until Stan stepped in, or They are going to make a mess of the mailing unless someone steps in and shows them what to do. [Late 1400s] Also see step into.

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Etymology

Origin of step-in

First recorded in 1920–25; adj., noun use of verb phrase step in