have a memory like a sieve(redirected from having a memory like a sieve)
have a memory like a sieve
To be exceptionally forgetful or absentminded. I need to start getting more sleep at night, because lately I've had a memory like a sieve. John has a memory like a sieve—I had to leave him three separate reminders about the play tomorrow night.
have a mind/memory like a ˈsieve(informal) forget things easily or quickly: I’m terribly sorry I didn’t remember your birthday — I’ve got a memory like a sieve.
A sieve is a kitchen tool with small holes in it, used for separating solids from liquids or very small pieces of food from larger pieces.