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An error; an oversight.
a mistake, blunder, or oversight.
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|Noun||1.||slip-up - a minor inadvertent mistake usually observed in speech or writing or in small accidents or memory lapses etc.|
error, fault, mistake - a wrong action attributable to bad judgment or ignorance or inattention; "he made a bad mistake"; "she was quick to point out my errors"; "I could understand his English in spite of his grammatical faults"
Freudian slip - a slip-up that (according to Sigmund Freud) results from the operation of unconscious wishes or conflicts and can reveal unconscious processes in normal healthy individuals
noun mistake, slip, error, misunderstanding, blunder, boob (Brit. slang), oversight, misconception, gaffe, inaccuracy, howler (informal), goof (informal), bloomer (Brit. informal), clanger (informal), miscalculation, error of judgment, false move, misstep, solecism The girls had made three crucial slip-ups.