cutting edge

Noun
  1. The position of greatest importance or advancement;
    The leading position in any movement or field (synset 106219154)
    "the Cotswolds were once at the forefront of woollen manufacturing in England"; "the idea of motion was always to the forefront of his mind and central to his philosophy"
  2. The sharp cutting side of the blade of a knife (synset 103629706)

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