American English

Definition of underperform verb from the Oxford Advanced American Dictionary

 

underperform

 verb
verb
NAmE//ˌʌndərpərˈfɔrm//
 
[intransitive]Verb Forms present simple I / you / we / they underperform
 
he / she / it underperforms
 
past simple underperformed
 
-ing form underperforming
 
 
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to not be as successful as was expected
See the Oxford Advanced Learner's Dictionary entry: underperform