performance mistake
Definition - Chomskyan terminology denoting speech or writing errors that result from problems — such as tiredness or nervousness — that affect your physical ability to use a language that under normal circumstance you would speak or write quite well.

1. As oppose to competence mistakes, which result from ignorance of the language or an inability to use it properly.

Etymology -
The term was coined by Noam Chomsky and popularized in his book Aspects of the Theory of Syntax (1965)

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