slip someone's mind

US /slɪp ˈsʌm.wʌnz maɪnd/
UK /slɪp ˈsʌm.wʌnz maɪnd/
"slip someone's mind" picture
1.

if something slips your mind, you forget it

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I meant to call her, but it completely slipped my mind.
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The meeting time must have slipped his mind.
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give someone the slipslipslip-oncross someone's mindput someone's mind at restmindmindful