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Verb: step in
  1. Get involved, so as to alter or hinder an action, or through force or threat of force
    "Why did the U.S. not step in earlier in WW II?";
    - intervene, interfere, interpose
     
  2. Act or speak as a replacement (for someone or something)
    - substitute, deputize, deputise [Brit], sub [informal]
Noun: step-in  step in
  1. Short underpants for women or children
    - pantie, panty, scanty

Derived forms: step-ins, stepping in, stepped in, steps in

Type of: chuddies [UK, dialect], interact, pants [Brit], replace, supercede [non-standard], supersede, supervene upon, supplant, underdacks [Austral], underdaks [Austral], underpants, undershorts [N. Amer]