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push the envelope verb

  /-ˈɑn-/ , /-ˈɒnv(ə)ləʊp/ , /ˌpʊʃ ði ˈɛnvəˌloʊp/ , /ˌpʊʃ ðiː ˈɛnvələʊp/
  • (intransitive, idiomatic, originally, aeronautics) To go beyond established limits; to pioneer. [from mid 20th c.]
 bis an die Grenze gehen
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