From Longman Dictionary of Contemporary Englishslip your mind/memoryslip your mind/memoryFORGETif something slips your mind, you forget it I meant to buy some milk, but it completely slipped my mind. → slip
Examples from the Corpus
slip your mind/memory• I can't believe it has slipped my mind.• Jean hadn't even asked Helen what she had said; the entire episode had slipped her mind.• Yes, that had slipped her mind.• You think something as important as that would slip my mind?• It slipped my mind because of the tragedy that followed.• It had slipped his mind entirely that today.• It completely slipped my mind I was going to be accused of theft!• He had seemed thrown for a moment, as though it had genuinely slipped his mind that he was about to be married. 