schoolboy error(redirected from a schoolboy error)
A very simple, basic, or fundamental mistake or error. Primarily heard in UK. Thanks to a schoolboy error by their opponents' keeper, the football club will advance to the next round of the tourney. The math textbook had to be reprinted after several schoolboy errors were discovered in some of the equations.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.