Failed to perform as well as expected or as well as previously; achieved results below anticipated standards or benchmarks. It indicates a shortfall between expected and actual performance.
Modern compound from 'under' (below) + 'perform,' from Old French 'parfournir' meaning 'to accomplish, carry out,' from 'par-' (completely) + 'fournir' (to furnish). The compound emphasizes performance below expectations.
The word 'perform' originally meant 'to furnish completely' - like furnishing a house with everything it needs! So underperformed means you didn't completely furnish what was expected.
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