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English definition of “step in”

step in

verb [I + adv/prep] uk phrasal verb with step   /step/ (-pp-) us  
to become involved in a difficult situation or argument in order to help find a solution: [+ to infinitive] An outside buyer has stepped in to save the company from going out of business. When the leading actress broke her leg, Isobel stepped in and took over.
(Definition of step in from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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