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envelope /ˈɛnvəˌloʊp/  /ˈɑːnvəˌloʊp/

  • noun
    plural -lopes
    [count] :an enclosing cover for a letter, card, etc. - see picture at mail
    push the envelope
    to go beyond the usual or normal limits by doing something new, dangerous, etc.
    a director who has pushed the envelope in his recent films
    a new airplane design that pushes the envelope