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Meaning of underperform

un•der•per•form

Pronunciation: (un"dur-pur-fôrm'), [key]
— v.t., v.i.
  1. to perform less well than (another of its kind, a general average, etc.) or less well than expected: Surprisingly, the stock has underperformed the market indexes all year. Several of our best players consistently underperform.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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