underperform

verb un·der·per·form \ˌən-dər-pə(r)-ˈfȯrm\

: to be less successful than expected or required

Full Definition of UNDERPERFORM

transitive verb

: to do worse than

intransitive verb

: to fail to do as well as expected

— un·der·per·for·mance \-ˈfȯr-mən(t)s\ noun

— un·der·per·form·er \-ˈfȯr-mər\ noun

See underperform defined for English-language learners

1971

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