slip your mind

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.
See also: mind, slip
Farlex Dictionary of Idioms.

slip your mind

If something slips your mind, you forget it. I was supposed to call her this morning and it slipped my mind. The reason for my visit had obviously slipped his mind.
See also: mind, slip
Collins COBUILD Idioms Dictionary, 3rd ed.
See also:
  • slip (one's) mind
  • slip mind
  • slip one's mind
  • slip somebody's memory/mind
  • have (one's) mind on other things
  • have your mind on other things
  • to my mind
  • have a mind to
  • have a mind to (do something)
  • have a mind to do something
References in periodicals archive
It's a task that can easily slip your mind when busy - but the consequences could be very dangerous and expensive
1 in 7 parents driving their kids around at the risk of a [pounds sterling]500 penalty fine - why and when it'll cost you; Busy parents have revealed they're guilty of it - are you one of them?
And with Father's Day just around the corner, make sure you don't let this slip your mind and get a red card from Dad.
World Cup fever at Lidl; JOIN A FESTIVAL OF FOOTBALL FUN WITH FAB OFFERS
There are things that slip your mind from time to time, like the rest of us there's so much going on it's easy to forget.
David Wells
We know that things can slip your mind at this time of year and having the reassurance of a last minute delivery service can be a real help."
THE GROCERY GURU
He added:"These things can slip your mind. But we will ensure they are sent off as a matter of priority."
DI'S REMEMBRANCE BOOKS FORGOTTEN; Tributes gather dust at Ulster printers because council did not send them to Althorp museum
You mean to clean but every day folds into the next, and basic chores seem to slip your mind.
Untitled (polyurethane objects and real objects)