[ uhn-der-per-fawrm ]
/ ˌʌn dər pərˈfɔrm /
verb (used with or without object)
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.
Related formsun·der·per·for·mance, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019