#blade.cutting_implement  the flat part of a tool or weapon that (usually) has a cutting edge
  supertype:  cutting_implement__cuttingimplement  a tool used for cutting or slicing
  subtype:  knife_blade  razorblade
  part of:  ax  knife  lawn_mower  pair_of_scissors  spatula  spatula.food_turner  sword
  part:  knife_edge__knifeedge__cutting_edge__cuttingedge  the sharp cutting side of the blade of a knife

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