#decrement__decrease  the amount by which something decreases
  exclusion:  increase.amount
  supertype:  amount  how much of something is available; "an adequate amount of food for four people"
  subtype:  drop.decrement__fall__free_fall  a sudden sharp decrease in some quantity: "a drop of 57 points on the Dow Jones index"; "there was a drop in pressure in the pulmonary artery"; "when that became known the price of their stock went into free fall"
     subtype:  voltage_drop__voltagedrop  a decrease in voltage along a conductor through which current is flowing
  subtype:  shrinkage  the amount by which something shrinks

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