Definition of underperform verb from the Oxford Advanced Learner's Dictionary

 

underperform

 verb
verb
BrE BrE//ˌʌndəpəˈfɔːm//
 
; NAmE NAmE//ˌʌndərpərˈfɔːrm//
 
[intransitive]Verb Forms present simple I / you / we / they underperform
BrE BrE//ˌʌndəpəˈfɔːm//
 
; NAmE NAmE//ˌʌndərpərˈfɔːrm//
 
he / she / it underperforms
BrE BrE//ˌʌndəpəˈfɔːmz//
 
; NAmE NAmE//ˌʌndərpərˈfɔːrmz//
 
past simple underperformed
BrE BrE//ˌʌndəpəˈfɔːmd//
 
; NAmE NAmE//ˌʌndərpərˈfɔːrmd//
 
past participle underperformed
BrE BrE//ˌʌndəpəˈfɔːmd//
 
; NAmE NAmE//ˌʌndərpərˈfɔːrmd//
 
-ing form underperforming
BrE BrE//ˌʌndəpəˈfɔːmɪŋ//
 
; NAmE NAmE//ˌʌndərpərˈfɔːrmɪŋ//
 
 
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to not be as successful as was expected
See the Oxford Advanced American Dictionary entry: underperform