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

 

underachieve

 verb
verb
BrE BrE//ˌʌndərəˈtʃiːv//
 
; NAmE NAmE//ˌʌndərəˈtʃiːv//
 
[intransitive]Verb Forms present simple I / you / we / they underachieve
BrE BrE//ˌʌndərəˈtʃiːv//
 
; NAmE NAmE//ˌʌndərəˈtʃiːv//
 
he / she / it underachieves
BrE BrE//ˌʌndərəˈtʃiːvz//
 
; NAmE NAmE//ˌʌndərəˈtʃiːvz//
 
past simple underachieved
BrE BrE//ˌʌndərəˈtʃiːvd//
 
; NAmE NAmE//ˌʌndərəˈtʃiːvd//
 
past participle underachieved
BrE BrE//ˌʌndərəˈtʃiːvd//
 
; NAmE NAmE//ˌʌndərəˈtʃiːvd//
 
-ing form underachieving
BrE BrE//ˌʌndərəˈtʃiːvɪŋ//
 
; NAmE NAmE//ˌʌndərəˈtʃiːvɪŋ//
 
 
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to do less well than you could do, especially in school work Too many boys are underachieving at school.
See the Oxford Advanced American Dictionary entry: underachieve