schoolboy
n. countable A2 Elementary US //ˈskuɫˌbɔɪ// UK //skˈuːlbɔɪ// school·boy
n. a boy who goes to school. You use this word to describe a young male student, usually at a primary or secondary school.
n. a male child or adolescent who attends school. Often used attributively to describe simple or basic errors that a more experienced person should not make.
The schoolboy carried a heavy backpack to class.
The local bus was crowded with schoolboys in their blue uniforms heading home for the day.
The veteran defender was embarrassed after making a schoolboy error that allowed the opposing team to score in the final minute of the match.
From school + boy.
Usage
Often used as a modifier in the phrase 'schoolboy error' to describe a basic or careless mistake.