schoolboy error

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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.
See also: error, schoolboy
References in periodicals archive ?
It would be a schoolboy error to lump the big six blindly in your acca, and schoolboy errors are best left to others, like England internationals and schoolboys.
Jones blasted: ``Their first goal was a schoolboy error from us and we totally switched off.
Kenny made a schoolboy error to gift Everton a draw on Saturday - but Warnock still believes he has the best keeper in the Premiership.