#limit.extent__bound__boundary  the greatest possible degree of something: "what he did was beyond the bounds of acceptable behavior"; "to the limit of his ability"
  supertype:  #extent  the distance over which something extends
  subtype:  #knife-edge__knifeedge  a narrow boundary; "he lived on a knife-edge between genius and insanity"
  subtype:  #thermal_barrier__heat_barrier  a limit to high speed flight imposed by aerodynamic heating
  subtype:  #utmost__uttermost__maximum__levelbest  the greatest possible degree; "he tried his utmost"
  subtype:  #verge.limit__brink  the limit beyond which something happens or changes; "on the verge of tears"; "on the brink of bankruptcy"

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