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slip mind
slip one's mind
[for something that was to be remembered] to be forgotten. I meant to go to the grocery store on the way home, but it slipped my mind. My birthday slipped my mind. I guess I wanted to forget it.
slip your mind
to be forgotten I meant to tell her that Nick had phoned, but it completely slipped my mind.
slip your mind
if something slips your mind, you forget about it I meant to tell her Nigel had phoned, but it completely slipped my mind.