step in

1. (verb) get involved, usually so as to hinder or halt an action; "Why did the U.S. not intervene earlier in WW II?"
Synonyms: interfere, interpose, intervene
Related Words: horn in, interact, interlope, intrude into, meddle, meddle with, poke into, tamper

2. (verb) act as a substitute for
Synonyms: deputize, stand in, substitute
Related Words: cover, replace, supersede, supervene upon, supplant



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