have a mind like a sieve

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have a mind like a sieve

To be exceptionally forgetful or absentminded. I need to start getting more sleep at night, because lately I've had a mind like a sieve. John has a mind like a sieve—I had to leave him three separate reminders about the play tomorrow night!
See also: have, like, mind, sieve

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.
See also: have, like, memory, mind, sieve