Definition of underachieve verb from the Oxford Advanced American Dictionary

 

underachieve

 verb
verb
NAmE//ˌʌndərəˈtʃiv//
 
[intransitive]Verb Forms present simple I / you / we / they underachieve
 
he / she / it underachieves
 
past simple underachieved
 
-ing form underachieving
 
 
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to do less well than you could do, especially in schoolwork Too many boys are underachieving at school.
underachievement
 
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NAmE//ˌʌndərəˈtʃivmənt//
 
noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: underachieve