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English definition of “intervene”

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intervene

verb [I] uk   /ˌɪn.təˈviːn/ us    /-t̬ɚ-/

intervene verb [I] (GET INVOLVED)

C2 to intentionally become involved in a difficult situation in order to improve it or prevent it from getting worse: The Central Bank intervened in the currency markets today to try to stabilize the exchange rate. [+ to infinitive] The minister intervened personally to stop the museum from being closed.
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intervene verb [I] (COME BETWEEN)

to happen between two times or between other events or activities: Two decades intervened between the completion of the design and the opening of the theatre.
intervention
noun [C or U] uk   /-ˈven.ʃən/ us  
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C2 Half the people questioned said they were opposed to military intervention (in the civil war). Repeated interventions on the currency markets have failed to prevent the value of the currency falling.
(Definition of intervene from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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