have a memory/mind like a sieve
US /hæv ə ˈmɛməri/maɪnd laɪk ə sɪv/
UK /hæv ə ˈmɛməri/maɪnd laɪk ə sɪv/
1.
to have a very bad memory; to forget things easily
:
•
I have a memory like a sieve; I can never remember where I put my keys.
•
She's always forgetting appointments; she really has a mind like a sieve.