slip somebody's memory/mind(redirected from slip somebody's memory)
slip (one's) mind
To be forgotten, especially of an obligation. I'm sorry I didn't call you back sooner, it totally slipped my 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.