step in

Verb
  1. Get involved, so as to alter or hinder an action, or through force or threat of force (synset 202544431)
    "Why did the U.S. not intervene earlier in WW II?"
    is a type of: interact - act together or towards others or with others
    subtypes:
    • meddle, tamper - intrude in other people's affairs or business; interfere unwantedly
    • interlope - encroach on the rights of others, as in trading without a proper license
    same as: interfere, interpose, intervene
  2. Act as a substitute (synset 202399804)
    "She stood in for the soprano who suffered from a cold"
    is a type of: replace, supersede, supervene upon, supplant - take the place or move into the position of
    subtypes: cover - help out by taking someone's place and temporarily assuming his responsibilities
    same as: deputise, deputize, substitute

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