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intervene

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verb [intransitive] intervene pronunciation in British English /ˌɪntə(r)ˈviːn/ 
Word Forms
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present tense
I/you/we/theyintervene
he/she/itintervenes
present participleintervening
past tenseintervened
past participleintervened
  1. 1
    to become involved in a situation in order to try to stop or change it

    The police had to intervene when protesters blocked traffic.

    intervene in:

    The prime minister has pledged not to intervene militarily in neighbouring countries.

  2. 3
    to delay an event, or to make it difficult to do

    My brother was studying to be a church minister, but the Second World War intervened.

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