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Meaning of underweight

un•der•weight

Pronunciation: (adj.un'dur-wāt'n.un'dur-wāt&sec), [key]
— adj.
  1. weighing less than is usual, required, or proper.
—n.
  1. deficiency in weight below a standard or requirement.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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