From Longman Dictionary of Contemporary Englishslip of the tongue/penslip of the tongue/penMISTAKEa small mistake you make when you are speaking or writing, especially by using the wrong word It was just a slip of the tongue. → Freudian slip → slip
Examples from the Corpus
slip of the tongue/pen• They both use the same root consonants, which are rearranged as in a dream or a slip of the tongue.• In all the excitement the Registrar, Mrs Molly Croll, suffered a slip of the pen.• Much of the humour derives from slips of the tongue, an occupational hazard.• One slip of the tongue would have betrayed all I was working for.• He had made an unfortunate slip of the tongue himself. 