interpose - definition and synonyms

verb [transitive] formal 

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/ˌɪntə(r)ˈpəʊz/
present tense
I/you/we/theyinterpose
he/she/itinterposes
present participleinterposing
past tenseinterposed
past participleinterposed
  1. 2
    to put someone or something in a position between two other people or things

    He swiftly interposed himself between his visitor and the door.