slip one's mind
Be overlooked or forgotten, as in I meant to pick up the wine but it slipped my mind. This idiom was first recorded about 1340.
Is it correct to say it slipped my mind?
Explanation: When you "slip," you fall. When it falls from the mind, it is no longer there. So when you forget about something, it is common to say, it "slipped my mind." "I was meaning to call you but it totally slipped my mind."
What do slipped my mind mean?
: to be forgotten by someone Her birthday completely slipped my mind.
