Definition of underclassman noun from the Oxford Advanced Learner's Dictionary

 

underclassman

 noun
noun
BrE BrE//ˌʌndəˈklɑːsmən//
 
; NAmE NAmE//ˌʌndərˈklæsmən//
 
(pl. underclassmen
BrE BrE//ˌʌndəˈklɑːsmən//
 
; NAmE NAmE//ˌʌndərˈklæsmən//
 
)
 
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(in the US) a male student in the first or second year of high school or college compare upperclassman
See the Oxford Advanced American Dictionary entry: underclassman