cutting edge

cutting edge
    n 1: the position of greatest importance or advancement; the
         leading position in any movement or field; "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" [syn:
         {vanguard}, {forefront}, {cutting edge}]
    2: the sharp cutting side of the blade of a knife [syn: {knife
       edge}, {cutting edge}]