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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
Noun: step-in  step in
  1. Short underpants for women or children (usually used in the plural)
    - pantie, panty, scanty

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