step in

Verb	1.	step in - get involved, so as to alter or hinder an action, or through force or threat of force; "Why did the U.S. not intervene earlier in WW II?" intervene, interfere, interpose interact - act together or towards others or with others; "He should interact more with his colleagues" horn in, intrude into, meddle with, poke into - poke one's nose into meddle, tamper - intrude in other people's affairs or business; interfere unwantedly; "Don't meddle in my affairs!" interlope - encroach on the rights of others, as in trading without a proper license
	2.	step in - act as a substitute; "She stood in for the soprano who suffered from a cold" deputise, deputize, substitute cover - help out by taking someone's place and temporarily assuming his responsibilities; "She is covering for our secretary who is ill this week" supersede, supervene upon, supplant, replace - take the place or move into the position of; "Smith replaced Miller as CEO after Miller left"; "the computer has supplanted the slide rule"; "Mary replaced Susan as the team's captain and the highest-ranked player in the school"

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